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12x+12=3x+89
We move all terms to the left:
12x+12-(3x+89)=0
We get rid of parentheses
12x-3x-89+12=0
We add all the numbers together, and all the variables
9x-77=0
We move all terms containing x to the left, all other terms to the right
9x=77
x=77/9
x=8+5/9
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