The triangles seem congruent due to the symbols on the sides and angle so the equations are equivalent allowing us to make this equation:
9x-17 = 4x+8
Using this we solve it to get x.
Add 17 to both sides.
9x = 4x+25
Subtract 4x from both sides.
5x=25
Divide both sides by 5 to make x by itself.
x=5.
So x is 5.
