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6x-27=3x+12
We move all terms to the left:
6x-27-(3x+12)=0
We get rid of parentheses
6x-3x-12-27=0
We add all the numbers together, and all the variables
3x-39=0
We move all terms containing x to the left, all other terms to the right
3x=39
x=39/3
x=13
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