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2v-40=3v-72
We move all terms to the left:
2v-40-(3v-72)=0
We get rid of parentheses
2v-3v+72-40=0
We add all the numbers together, and all the variables
-1v+32=0
We move all terms containing v to the left, all other terms to the right
-v=-32
v=-32/-1
v=+32
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