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31=3v+10
We move all terms to the left:
31-(3v+10)=0
We get rid of parentheses
-3v-10+31=0
We add all the numbers together, and all the variables
-3v+21=0
We move all terms containing v to the left, all other terms to the right
-3v=-21
v=-21/-3
v=+7
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