Without knowing the value of x and the required unit of length then a meaningful answer to this question cannot be provided.
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4x + 8 + 7x + 12 = 11x + 20
7x + 8 = 36 - 8 = - 8 -------------- 7x = 28 7x/7 = 28/7 x = 4
x2+7x-8 = (x-1(x+8)
8+7x = 20+3x 7x-3x = 20-8 4x = 12 x = 3
Subtract 7x from each side: 8 = -9 Not possible, game over.