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2x+2x+(4x+8)2=88
We move all terms to the left:
2x+2x+(4x+8)2-(88)=0
We add all the numbers together, and all the variables
4x+(4x+8)2-88=0
We multiply parentheses
4x+8x+16-88=0
We add all the numbers together, and all the variables
12x-72=0
We move all terms containing x to the left, all other terms to the right
12x=72
x=72/12
x=6
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