Question

How do i find x and all three sides?

Answer 1

Well,you can use the pythagorean theorem,which is a^2+b^2=c^2 to solve for x.

Answer 2

$x+31$ and $2x-59$ are congruent sides

So we have
$2x-59=x+31$
⇒$x-59=31$
⇒$x=90$

Plug in:
$x+31=90+31=121$
$2x-59=2(90)-59=180-59=121$
$x-7=90-7=83$