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X+12=3X-30
We move all terms to the left:
X+12-(3X-30)=0
We get rid of parentheses
X-3X+30+12=0
We add all the numbers together, and all the variables
-2X+42=0
We move all terms containing X to the left, all other terms to the right
-2X=-42
X=-42/-2
X=+21
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