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4v+71=7v-100
We move all terms to the left:
4v+71-(7v-100)=0
We get rid of parentheses
4v-7v+100+71=0
We add all the numbers together, and all the variables
-3v+171=0
We move all terms containing v to the left, all other terms to the right
-3v=-171
v=-171/-3
v=+57
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