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4x-12=-4x-124
We move all terms to the left:
4x-12-(-4x-124)=0
We get rid of parentheses
4x+4x+124-12=0
We add all the numbers together, and all the variables
8x+112=0
We move all terms containing x to the left, all other terms to the right
8x=-112
x=-112/8
x=-14
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