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X-4=3X+
We move all terms to the left:
X-4-(3X+)=0
We add all the numbers together, and all the variables
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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