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3v-43=4v-64
We move all terms to the left:
3v-43-(4v-64)=0
We get rid of parentheses
3v-4v+64-43=0
We add all the numbers together, and all the variables
-1v+21=0
We move all terms containing v to the left, all other terms to the right
-v=-21
v=-21/-1
v=+21
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