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8x-(1+7x)=89
We move all terms to the left:
8x-(1+7x)-(89)=0
We add all the numbers together, and all the variables
8x-(7x+1)-89=0
We get rid of parentheses
8x-7x-1-89=0
We add all the numbers together, and all the variables
x-90=0
We move all terms containing x to the left, all other terms to the right
x=90
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