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X+3=-12-2X
We move all terms to the left:
X+3-(-12-2X)=0
We add all the numbers together, and all the variables
X-(-2X-12)+3=0
We get rid of parentheses
X+2X+12+3=0
We add all the numbers together, and all the variables
3X+15=0
We move all terms containing X to the left, all other terms to the right
3X=-15
X=-15/3
X=-5
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