9514 1404 393
Answer:
x = 35
Step-by-step explanation:
The marked consecutive interior angles are supplementary:
(x +12)° +(4x -7)° = 180°
5x +5 = 180 . . . . . collect terms, divide by °
x + 1 = 36 . . . . . . . divide by 5
x = 35 . . . . . . . . . . subtract 1
