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3+8v=5v-12
We move all terms to the left:
3+8v-(5v-12)=0
We get rid of parentheses
8v-5v+12+3=0
We add all the numbers together, and all the variables
3v+15=0
We move all terms containing v to the left, all other terms to the right
3v=-15
v=-15/3
v=-5
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