Explanations on how to set it up would be great!

you so so much in

don't reply if you're unsure, i genuinely need ///:

Hi,
u know rhombus means
a parallelogram with opposite equal acute angles, opposite equal obtuse angles, and four equal sides.any parallelogram with equal sides, including a square.

l then u should keep 5x-11=2x+4
3x=15
x=5

so answer is for values of x=5the fig is rhombus