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3x-6x-15=12x+12
We move all terms to the left:
3x-6x-15-(12x+12)=0
We add all the numbers together, and all the variables
-3x-(12x+12)-15=0
We get rid of parentheses
-3x-12x-12-15=0
We add all the numbers together, and all the variables
-15x-27=0
We move all terms containing x to the left, all other terms to the right
-15x=27
x=27/-15
x=-1+4/5
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