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-3(-1+-x)=-12
We move all terms to the left:
-3(-1+-x)-(-12)=0
We add all the numbers together, and all the variables
-3(-1x)-(-12)=0
We add all the numbers together, and all the variables
-3(-1x)+12=0
We multiply 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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