Answer:
x = 12 degrees
Step-by-step explanation:
3x = x+24
2x=24
x=12
The two angles marked in red are the same length, because we're given that the two lines are parallel and they are internally on opposite sides of each other. This is known as the alternate interior angles theorem, as they are on alternate sides, and they are on the interior of the intersection between the parallel lines and the transversal.
