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81-(3x-3)=x
We move all terms to the left:
81-(3x-3)-(x)=0
We add all the numbers together, and all the variables
-1x-(3x-3)+81=0
We get rid of parentheses
-1x-3x+3+81=0
We add all the numbers together, and all the variables
-4x+84=0
We move all terms containing x to the left, all other terms to the right
-4x=-84
x=-84/-4
x=+21
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