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81+12x=24x+9
We move all terms to the left:
81+12x-(24x+9)=0
We get rid of parentheses
12x-24x-9+81=0
We add all the numbers together, and all the variables
-12x+72=0
We move all terms containing x to the left, all other terms to the right
-12x=-72
x=-72/-12
x=+6
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