Respuesta :

Kaikerscupcake
Hello there! :D

Find the scale of the sides. 

40/5=8 (the longer side is 8 times bigger than the shorter one)

3*8= 24

2x+10=24

Subtract 10 on both sides.

2x=14

Divide by two on both sides.

x=7

I hope this helps!
~kaikers

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