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31v-27=43v-75
We move all terms to the left:
31v-27-(43v-75)=0
We get rid of parentheses
31v-43v+75-27=0
We add all the numbers together, and all the variables
-12v+48=0
We move all terms containing v to the left, all other terms to the right
-12v=-48
v=-48/-12
v=+4
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