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X+6+3X=-12+X
We move all terms to the left:
X+6+3X-(-12+X)=0
We add all the numbers together, and all the variables
X+3X-(X-12)+6=0
We add all the numbers together, and all the variables
4X-(X-12)+6=0
We get rid of parentheses
4X-X+12+6=0
We add all the numbers together, and all the variables
3X+18=0
We move all terms containing X to the left, all other terms to the right
3X=-18
X=-18/3
X=-6
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