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12x=3x+81
We move all terms to the left:
12x-(3x+81)=0
We get rid of parentheses
12x-3x-81=0
We add all the numbers together, and all the variables
9x-81=0
We move all terms containing x to the left, all other terms to the right
9x=81
x=81/9
x=9
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