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3(3-8x)=81
We move all terms to the left:
3(3-8x)-(81)=0
We add all the numbers together, and all the variables
3(-8x+3)-81=0
We multiply parentheses
-24x+9-81=0
We add all the numbers together, and all the variables
-24x-72=0
We move all terms containing x to the left, all other terms to the right
-24x=72
x=72/-24
x=-3
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