Answer:
79 degrees
Explanation:
x and the angle that measures 79 degrees are alternate interior angles, which makes them the same measure.
Alternate interior angles are both on the inner sides of the parallel lines but on opposite sides of the transversal, which is the diagonal line crossing m and n. Another way you can identify these angles is by noticing the "Z" shape that they make.
I hope this helps! Please comment if you have any questions.