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2v-54=21-1v
We move all terms to the left:
2v-54-(21-1v)=0
We add all the numbers together, and all the variables
2v-(-1v+21)-54=0
We get rid of parentheses
2v+1v-21-54=0
We add all the numbers together, and all the variables
3v-75=0
We move all terms containing v to the left, all other terms to the right
3v=75
v=75/3
v=25
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