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12x-15=3x+66
We move all terms to the left:
12x-15-(3x+66)=0
We get rid of parentheses
12x-3x-66-15=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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