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