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15v=9v+12
We move all terms to the left:
15v-(9v+12)=0
We get rid of parentheses
15v-9v-12=0
We add all the numbers together, and all the variables
6v-12=0
We move all terms containing v to the left, all other terms to the right
6v=12
v=12/6
v=2
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