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3x-12=-(x+6)
We move all terms to the left:
3x-12-(-(x+6))=0
We calculate terms in parentheses: -(-(x+6)), so:We get rid of parentheses
-(x+6)
We get rid of parentheses
-x-6
We add all the numbers together, and all the variables
-1x-6
Back to the equation:
-(-1x-6)
3x+1x+6-12=0
We add all the numbers together, and all the variables
4x-6=0
We move all terms containing x to the left, all other terms to the right
4x=6
x=6/4
x=1+1/2
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