Question

3x+20 10x -15 what does x equal?

Answer 1

If these are the values of vertical angles, since vertical angles are congruent, you would set them equal to each other to find x, like so:

3x + 20 = 10x - 15
3x + 35 = 10x
35 = 7x
5 = x

Answer:
x = 5

Hope this helps!