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X+3X=6-3X=0
We move all terms to the left:
X+3X-(6-3X)=0
We add all the numbers together, and all the variables
X+3X-(-3X+6)=0
We add all the numbers together, and all the variables
4X-(-3X+6)=0
We get rid of parentheses
4X+3X-6=0
We add all the numbers together, and all the variables
7X-6=0
We move all terms containing X to the left, all other terms to the right
7X=6
X=6/7
X=6/7
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