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6x+18=3x-81
We move all terms to the left:
6x+18-(3x-81)=0
We get rid of parentheses
6x-3x+81+18=0
We add all the numbers together, and all the variables
3x+99=0
We move all terms containing x to the left, all other terms to the right
3x=-99
x=-99/3
x=-33
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