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-12x-9=6x+27
We move all terms to the left:
-12x-9-(6x+27)=0
We get rid of parentheses
-12x-6x-27-9=0
We add all the numbers together, and all the variables
-18x-36=0
We move all terms containing x to the left, all other terms to the right
-18x=36
x=36/-18
x=-2
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