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12x-4x+124=12x+80
We move all terms to the left:
12x-4x+124-(12x+80)=0
We add all the numbers together, and all the variables
8x-(12x+80)+124=0
We get rid of parentheses
8x-12x-80+124=0
We add all the numbers together, and all the variables
-4x+44=0
We move all terms containing x to the left, all other terms to the right
-4x=-44
x=-44/-4
x=+11
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