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2v+42=7v-83
We move all terms to the left:
2v+42-(7v-83)=0
We get rid of parentheses
2v-7v+83+42=0
We add all the numbers together, and all the variables
-5v+125=0
We move all terms containing v to the left, all other terms to the right
-5v=-125
v=-125/-5
v=+25
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