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3(6-3x)=81
We move all terms to the left:
3(6-3x)-(81)=0
We add all the numbers together, and all the variables
3(-3x+6)-81=0
We multiply parentheses
-9x+18-81=0
We add all the numbers together, and all the variables
-9x-63=0
We move all terms containing x to the left, all other terms to the right
-9x=63
x=63/-9
x=-7
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