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X+3=3X-+
We move all terms to the left:
X+3-(3X-+)=0
We add all the numbers together, and all the variables
X-(+3X)+3=0
We get rid of parentheses
X-3X+3=0
We add all the numbers together, and all the variables
-2X+3=0
We move all terms containing X to the left, all other terms to the right
-2X=-3
X=-3/-2
X=1+1/2
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