Solve for x
Ax + B = C

(C - B)/A = x

Step-by-step explanation:

Ax + B = C

      -B    -B

Ax = C - B

Divide both sides by A

x = (C - B)/A

(C - B)/A = x

to find the perimeter of the rectangle this is the expression:

x-9+x-9+3x-4+3x-4=138

if we simplify it:

8x-26=138

remember, 138 is what it all adds up to

the length is 11.5cm

the width is 57.5cm

the area is 661.25cm^2

the answers might not be correct use at own risk