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X+3X-7X=4X-2
We move all terms to the left:
X+3X-7X-(4X-2)=0
We add all the numbers together, and all the variables
-3X-(4X-2)=0
We get rid of parentheses
-3X-4X+2=0
We add all the numbers together, and all the variables
-7X+2=0
We move all terms containing X to the left, all other terms to the right
-7X=-2
X=-2/-7
X=2/7
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