diff --git a/advent-of-code/2024/day_07/.formatter.exs b/advent-of-code/2024/day_07/.formatter.exs
new file mode 100644
index 0000000..d2cda26
--- /dev/null
+++ b/advent-of-code/2024/day_07/.formatter.exs
@@ -0,0 +1,4 @@
+# Used by "mix format"
+[
+  inputs: ["{mix,.formatter}.exs", "{config,lib,test}/**/*.{ex,exs}"]
+]
diff --git a/advent-of-code/2024/day_07/.gitignore b/advent-of-code/2024/day_07/.gitignore
new file mode 100644
index 0000000..99e5da0
--- /dev/null
+++ b/advent-of-code/2024/day_07/.gitignore
@@ -0,0 +1,26 @@
+# The directory Mix will write compiled artifacts to.
+/_build/
+
+# If you run "mix test --cover", coverage assets end up here.
+/cover/
+
+# The directory Mix downloads your dependencies sources to.
+/deps/
+
+# Where third-party dependencies like ExDoc output generated docs.
+/doc/
+
+# Ignore .fetch files in case you like to edit your project deps locally.
+/.fetch
+
+# If the VM crashes, it generates a dump, let's ignore it too.
+erl_crash.dump
+
+# Also ignore archive artifacts (built via "mix archive.build").
+*.ez
+
+# Ignore package tarball (built via "mix hex.build").
+day_07-*.tar
+
+# Temporary files, for example, from tests.
+/tmp/
diff --git a/advent-of-code/2024/day_07/README.md b/advent-of-code/2024/day_07/README.md
new file mode 100644
index 0000000..5eb3074
--- /dev/null
+++ b/advent-of-code/2024/day_07/README.md
@@ -0,0 +1,64 @@
+# Day 7: Bridge Repair
+
+The Historians take you to a familiar rope bridge over a river in the middle of a jungle.
+The Chief isn't on this side of the bridge, though; maybe he's on the other side?
+
+When you go to cross the bridge, you notice a group of engineers trying to repair it. (Apparently, it breaks pretty frequently.)
+You won't be able to cross until it's fixed.
+
+You ask how long it'll take; the engineers tell you that it only needs final calibrations,
+but some young elephants were playing nearby and stole all the operators from their calibration equations!
+They could finish the calibrations if only someone could determine which test values could possibly be produced
+by placing any combination of operators into their calibration equations (your puzzle input).
+
+For example:
+
+```
+190: 10 19
+3267: 81 40 27
+83: 17 5
+156: 15 6
+7290: 6 8 6 15
+161011: 16 10 13
+192: 17 8 14
+21037: 9 7 18 13
+292: 11 6 16 20
+```
+
+Each line represents a single equation. The test value appears before the colon on each line;
+it is your job to determine whether the remaining numbers can be combined with operators to produce the test value.
+
+Operators are always evaluated left-to-right, not according to precedence rules.
+Furthermore, numbers in the equations cannot be rearranged. Glancing into the jungle, you can see elephants holding
+two different types of operators: add (+) and multiply (*).
+
+Only three of the above equations can be made true by inserting operators:
+
+- 190: 10 19 has only one position that accepts an operator: between 10 and 19. Choosing + would give 29, but choosing * would give the test value (10 * 19 = 190).
+- 3267: 81 40 27 has two positions for operators. Of the four possible configurations of the operators, two cause the right side to match the test value: 81 + 40 * 27 and 81 * 40 + 27 both equal 3267 (when evaluated left-to-right)!
+- 292: 11 6 16 20 can be solved in exactly one way: 11 + 6 * 16 + 20.
+
+The engineers just need the total calibration result, which is the sum of the test values from just the equations that could possibly be true.
+In the above example, the sum of the test values for the three equations listed above is 3749.
+
+Determine which equations could possibly be true. What is their total calibration result?
+
+## Part Two
+
+The engineers seem concerned; the total calibration result you gave them is nowhere close to being within safety tolerances.
+Just then, you spot your mistake: some well-hidden elephants are holding a third type of operator.
+
+The concatenation operator (||) combines the digits from its left and right inputs into a single number.
+For example, 12 || 345 would become 12345. All operators are still evaluated left-to-right.
+
+Now, apart from the three equations that could be made true using only addition and multiplication,
+the above example has three more equations that can be made true by inserting operators:
+
+- 156: 15 6 can be made true through a single concatenation: 15 || 6 = 156.
+- 7290: 6 8 6 15 can be made true using 6 * 8 || 6 * 15.
+- 192: 17 8 14 can be made true using 17 || 8 + 14.
+
+Adding up all six test values (the three that could be made before using only + and * plus the new three that can now be made by also using ||)
+produces the new total calibration result of 11387.
+
+Using your new knowledge of elephant hiding spots, determine which equations could possibly be true. What is their total calibration result?
diff --git a/advent-of-code/2024/day_07/input.txt b/advent-of-code/2024/day_07/input.txt
new file mode 100644
index 0000000..b497a77
--- /dev/null
+++ b/advent-of-code/2024/day_07/input.txt
@@ -0,0 +1,850 @@
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diff --git a/advent-of-code/2024/day_07/lib/evaluator.ex b/advent-of-code/2024/day_07/lib/evaluator.ex
new file mode 100644
index 0000000..be41c57
--- /dev/null
+++ b/advent-of-code/2024/day_07/lib/evaluator.ex
@@ -0,0 +1,43 @@
+defmodule Evaluator do
+  @doc """
+  Parameters:
+  - `equations` is a list of {test value, numbers} tuples.
+  - `operations` is a list of functions that may be applied to numbers.
+
+        iex> Evaluator.get_calibration_result([{4, [2, 2]}], [&Kernel.+/2])
+        4
+  """
+  def get_calibration_result(equations, operations) do
+    equations
+    |> Enum.filter(fn {test_value, numbers} -> could_be_true?(test_value, numbers, operations) end)
+    |> Enum.map(fn {test_value, _} -> test_value end)
+    |> Enum.sum()
+  end
+
+  def could_be_true?(test_value, numbers, operations) do
+    res =
+      get_variants(numbers, operations)
+      |> Enum.find(fn x -> x == test_value end)
+
+    res != nil
+  end
+
+  # Very slow...
+  def get_variants([n1 | tail], operations) do
+    case tail do
+      [] ->
+        [n1]
+
+      [n2 | new_tail] ->
+        operations
+        |> Enum.map(fn op -> op.(n1, n2) end)
+        |> Enum.map(fn op_res -> get_variants([op_res | new_tail], operations) end)
+        |> Enum.concat()
+    end
+  end
+
+  def concat(n1, n2) do
+    n3 = Integer.to_string(n1) <> Integer.to_string(n2)
+    String.to_integer(n3)
+  end
+end
diff --git a/advent-of-code/2024/day_07/lib/solve.ex b/advent-of-code/2024/day_07/lib/solve.ex
new file mode 100644
index 0000000..89c384b
--- /dev/null
+++ b/advent-of-code/2024/day_07/lib/solve.ex
@@ -0,0 +1,29 @@
+defmodule Mix.Tasks.Solve do
+  use Mix.Task
+
+  @impl Mix.Task
+  def run(_) do
+    input =
+      File.stream!("input.txt")
+      |> Stream.map(&String.trim/1)
+      |> Stream.map(fn str -> String.split(str, ": ") end)
+      |> Stream.map(fn [test_value | numbers] ->
+        {String.to_integer(test_value), parse_numbers(hd(numbers))}
+      end)
+      |> Enum.to_list()
+
+    res1 = Evaluator.get_calibration_result(input, [&Kernel.+/2, &Kernel.*/2])
+    IO.puts("Part 1: #{res1}")
+
+    res2 =
+      Evaluator.get_calibration_result(input, [&Kernel.+/2, &Kernel.*/2, &Evaluator.concat/2])
+
+    IO.puts("Part 2: #{res2}")
+  end
+
+  def parse_numbers(nums) do
+    nums
+    |> String.split()
+    |> Enum.map(&String.to_integer/1)
+  end
+end
diff --git a/advent-of-code/2024/day_07/mix.exs b/advent-of-code/2024/day_07/mix.exs
new file mode 100644
index 0000000..351fecd
--- /dev/null
+++ b/advent-of-code/2024/day_07/mix.exs
@@ -0,0 +1,28 @@
+defmodule Day07.MixProject do
+  use Mix.Project
+
+  def project do
+    [
+      app: :day_07,
+      version: "0.1.0",
+      elixir: "~> 1.16",
+      start_permanent: Mix.env() == :prod,
+      deps: deps()
+    ]
+  end
+
+  # Run "mix help compile.app" to learn about applications.
+  def application do
+    [
+      extra_applications: [:logger]
+    ]
+  end
+
+  # Run "mix help deps" to learn about dependencies.
+  defp deps do
+    [
+      # {:dep_from_hexpm, "~> 0.3.0"},
+      # {:dep_from_git, git: "https://github.com/elixir-lang/my_dep.git", tag: "0.1.0"}
+    ]
+  end
+end
diff --git a/advent-of-code/2024/day_07/test/evaluator_test.exs b/advent-of-code/2024/day_07/test/evaluator_test.exs
new file mode 100644
index 0000000..d111c75
--- /dev/null
+++ b/advent-of-code/2024/day_07/test/evaluator_test.exs
@@ -0,0 +1,4 @@
+defmodule EvaluatorTest do
+  use ExUnit.Case
+  doctest Evaluator
+end
diff --git a/advent-of-code/2024/day_07/test/test_helper.exs b/advent-of-code/2024/day_07/test/test_helper.exs
new file mode 100644
index 0000000..869559e
--- /dev/null
+++ b/advent-of-code/2024/day_07/test/test_helper.exs
@@ -0,0 +1 @@
+ExUnit.start()