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12x-3=3x+27
We move all terms to the left:
12x-3-(3x+27)=0
We get rid of parentheses
12x-3x-27-3=0
We add all the numbers together, and all the variables
9x-30=0
We move all terms containing x to the left, all other terms to the right
9x=30
x=30/9
x=3+1/3
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