Can someone explain how to do this?

Answer:
12°
Step-by-step explanation:
The two shaded angles are alternate-interior angles
(Either side of the transversal line, and inside both parallel lines, AB||CD)
10x + 5 = 12x - 19
10x + 24 = 12x
24 = 2x
x = 12
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-Chetan K
Answer:
x=12
Step-by-step explanation:
You set 10x+5 equal to 12x-19. then you solve like a regular equation to get x