In order for the parallelogram to be a rectangle, x = ?

For this to be a rectangle each corner needs to have an angle of 90 degrees.
13x +34 + 10x +10 = 90
Simplify:
23x + 44 = 90
Subtract 44 from each side:
23x = 46
Divide both sides by 23:
x = 46 / 23
x = 2