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8v-29=3v+21
We move all terms to the left:
8v-29-(3v+21)=0
We get rid of parentheses
8v-3v-21-29=0
We add all the numbers together, and all the variables
5v-50=0
We move all terms containing v to the left, all other terms to the right
5v=50
v=50/5
v=10
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