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2x+12=-x-12
We move all terms to the left:
2x+12-(-x-12)=0
We add all the numbers together, and all the variables
2x-(-1x-12)+12=0
We get rid of parentheses
2x+1x+12+12=0
We add all the numbers together, and all the variables
3x+24=0
We move all terms containing x to the left, all other terms to the right
3x=-24
x=-24/3
x=-8
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