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-7x-3(7x+8)=88
We move all terms to the left:
-7x-3(7x+8)-(88)=0
We multiply parentheses
-7x-21x-24-88=0
We add all the numbers together, and all the variables
-28x-112=0
We move all terms containing x to the left, all other terms to the right
-28x=112
x=112/-28
x=-4
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