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6=-12-6x-3x
We move all terms to the left:
6-(-12-6x-3x)=0
We add all the numbers together, and all the variables
-(-9x-12)+6=0
We get rid of parentheses
9x+12+6=0
We add all the numbers together, and all the variables
9x+18=0
We move all terms containing x to the left, all other terms to the right
9x=-18
x=-18/9
x=-2
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