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X=3X-4
We move all terms to the left:
X-(3X-4)=0
We get rid of parentheses
X-3X+4=0
We add all the numbers together, and all the variables
-2X+4=0
We move all terms containing X to the left, all other terms to the right
-2X=-4
X=-4/-2
X=+2
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