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