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39=3v+12
We move all terms to the left:
39-(3v+12)=0
We get rid of parentheses
-3v-12+39=0
We add all the numbers together, and all the variables
-3v+27=0
We move all terms containing v to the left, all other terms to the right
-3v=-27
v=-27/-3
v=+9
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