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80=4x+12
We move all terms to the left:
80-(4x+12)=0
We get rid of parentheses
-4x-12+80=0
We add all the numbers together, and all the variables
-4x+68=0
We move all terms containing x to the left, all other terms to the right
-4x=-68
x=-68/-4
x=+17
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