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6(2x-3)=x+81
We move all terms to the left:
6(2x-3)-(x+81)=0
We multiply parentheses
12x-(x+81)-18=0
We get rid of parentheses
12x-x-81-18=0
We add all the numbers together, and all the variables
11x-99=0
We move all terms containing x to the left, all other terms to the right
11x=99
x=99/11
x=9
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