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X-8X=12-3X
We move all terms to the left:
X-8X-(12-3X)=0
We add all the numbers together, and all the variables
X-8X-(-3X+12)=0
We add all the numbers together, and all the variables
-7X-(-3X+12)=0
We get rid of parentheses
-7X+3X-12=0
We add all the numbers together, and all the variables
-4X-12=0
We move all terms containing X to the left, all other terms to the right
-4X=12
X=12/-4
X=-3
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