Ok got it. If you have any questions just ask in the chat below :)
Being an isosceles, both sides would be equal.
5X - 32 = 2x +61
Add 32 to each side:
5X = 2X + 93
Subtract 2X from each side:
3X = 93
Divide both sides by 3:
X = 93/3
X = 31
There both 4 and there are the 4th number