Fill in the box to make the equation true.
7x- something +5x=6x

The missing value is

Step-by-step explanation:

Let the unknown value be y

Group like terms and simplify

So...

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