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12X+3=9X+27
We move all terms to the left:
12X+3-(9X+27)=0
We get rid of parentheses
12X-9X-27+3=0
We add all the numbers together, and all the variables
3X-24=0
We move all terms containing X to the left, all other terms to the right
3X=24
X=24/3
X=8
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