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6x+12=-3x-12
We move all terms to the left:
6x+12-(-3x-12)=0
We get rid of parentheses
6x+3x+12+12=0
We add all the numbers together, and all the variables
9x+24=0
We move all terms containing x to the left, all other terms to the right
9x=-24
x=-24/9
x=-2+2/3
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