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X-12=3X-48
We move all terms to the left:
X-12-(3X-48)=0
We get rid of parentheses
X-3X+48-12=0
We add all the numbers together, and all the variables
-2X+36=0
We move all terms containing X to the left, all other terms to the right
-2X=-36
X=-36/-2
X=+18
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