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31=v/5+15
We move all terms to the left:
31-(v/5+15)=0
We get rid of parentheses
-v/5-15+31=0
We multiply all the terms by the denominator
-v-15*5+31*5=0
We add all the numbers together, and all the variables
-1v+80=0
We move all terms containing v to the left, all other terms to the right
-v=-80
v=-80/-1
v=+80
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