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v+38=2v+21
We move all terms to the left:
v+38-(2v+21)=0
We get rid of parentheses
v-2v-21+38=0
We add all the numbers together, and all the variables
-1v+17=0
We move all terms containing v to the left, all other terms to the right
-v=-17
v=-17/-1
v=+17
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