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4v+28=12v-12
We move all terms to the left:
4v+28-(12v-12)=0
We get rid of parentheses
4v-12v+12+28=0
We add all the numbers together, and all the variables
-8v+40=0
We move all terms containing v to the left, all other terms to the right
-8v=-40
v=-40/-8
v=+5
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