Respuesta :

mlarsen5000

Answer:

x=5

EF = 22in.

Step-by-step explanation:

We know EF and DE are equal, so we can solve for x.

5x-3=3x+7

5x-3x=7+3

2x=10

x=5

Now we plug that into EF.

EF = 3x+7 = 3(5)+7 = 15+7=22