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5(v+3)-2v=21
We move all terms to the left:
5(v+3)-2v-(21)=0
We add all the numbers together, and all the variables
-2v+5(v+3)-21=0
We multiply parentheses
-2v+5v+15-21=0
We add all the numbers together, and all the variables
3v-6=0
We move all terms containing v to the left, all other terms to the right
3v=6
v=6/3
v=2
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