Solve this:

Solve this: 12 The sides of a rectangle are 3x + y and 7x + 2.v. Find its erimeter.

 so let the length be 3x+y and let the breath be 7x+2y
t​​he formula of perimeter of a rectangle is 2(L+B)
                                                                 = 2(​3x+y+​7x+2y)
thus 20x+2y is the perimeter​
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