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12=-5X+3X
We move all terms to the left:
12-(-5X+3X)=0
We add all the numbers together, and all the variables
-(-2X)+12=0
We get rid of parentheses
2X+12=0
We move all terms containing X to the left, all other terms to the right
2X=-12
X=-12/2
X=-6
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