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X=3X-120
We move all terms to the left:
X-(3X-120)=0
We get rid of parentheses
X-3X+120=0
We add all the numbers together, and all the variables
-2X+120=0
We move all terms containing X to the left, all other terms to the right
-2X=-120
X=-120/-2
X=+60
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