Question

Look at the figure. What is the value of x

Answer 1

I think is
3x = 5x - 30
- 2x = - 30
x = 15

Answer 2

This triangle is isosceles (indicated by the tick marks), which means its base angles are congruent; given this, you can set them equal to each other to solve for x:

3x = 5x - 30
-2x = -30
x = 15

Answer:
x = 15

Hope this helps!