Answer:
10
Explanation:
These angles are equal, and I think its called the alternate interior angles theorem. So all you have to do is set them equal to each other and solve for x:
9x + 5 = 8x + 15
Put the independent numbers and the x's on the same side, by subtracting 8x and 5 from each side:
x = 10
There You have x.
Hope this helped!
