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(-3x-12)-(-7-x)=-3x-12-7+x
We move all terms to the left:
(-3x-12)-(-7-x)-(-3x-12-7+x)=0
We add all the numbers together, and all the variables
(-3x-12)-(-1x-7)-(-2x-19)=0
We get rid of parentheses
-3x+1x+2x-12+7+19=0
We add all the numbers together, and all the variables
14!=0
There is no solution for this equation
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