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15=v/3+8
We move all terms to the left:
15-(v/3+8)=0
We get rid of parentheses
-v/3-8+15=0
We multiply all the terms by the denominator
-v-8*3+15*3=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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