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12x-6=3x+66
We move all terms to the left:
12x-6-(3x+66)=0
We get rid of parentheses
12x-3x-66-6=0
We add all the numbers together, and all the variables
9x-72=0
We move all terms containing x to the left, all other terms to the right
9x=72
x=72/9
x=8
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