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