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x+(x+8)+2(x+8)=76
We move all terms to the left:
x+(x+8)+2(x+8)-(76)=0
We multiply parentheses
x+(x+8)+2x+16-76=0
We get rid of parentheses
x+x+2x+8+16-76=0
We add all the numbers together, and all the variables
4x-52=0
We move all terms containing x to the left, all other terms to the right
4x=52
x=52/4
x=13
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