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