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1x+6=-2x-6
We move all terms to the left:
1x+6-(-2x-6)=0
We add all the numbers together, and all the variables
x-(-2x-6)+6=0
We get rid of parentheses
x+2x+6+6=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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