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