Answer:
x = 15
Step-by-step explanation:
these two labeled angles are supplementary because they are same-side interior angles
we can add them together and set the sum equal to 180 to find 'x'
3x - 15 + 150 = 180
combine -15 and 150 to get 135
3x + 135 = 180
subtract 135 from each side to get:
3x = 45
divide each side by 3 to get:
x = 15
