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19v=15v+12
We move all terms to the left:
19v-(15v+12)=0
We get rid of parentheses
19v-15v-12=0
We add all the numbers together, and all the variables
4v-12=0
We move all terms containing v to the left, all other terms to the right
4v=12
v=12/4
v=3
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