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-x+4=-3x-12
We move all terms to the left:
-x+4-(-3x-12)=0
We add all the numbers together, and all the variables
-1x-(-3x-12)+4=0
We get rid of parentheses
-1x+3x+12+4=0
We add all the numbers together, and all the variables
2x+16=0
We move all terms containing x to the left, all other terms to the right
2x=-16
x=-16/2
x=-8
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