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Kaikerscupcake
Hey there! :D

The diagonals are congruent. They will be the same measure.

8x+3= 4x+7

Subtract 3 on both sides. 

8x=4x+4

Subtract 4x on both sides. 

4x=4

Divide both sides by 4.

x=1

I hope this helps!
~kaiker

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