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30=v/3+12
We move all terms to the left:
30-(v/3+12)=0
We get rid of parentheses
-v/3-12+30=0
We multiply all the terms by the denominator
-v-12*3+30*3=0
We add all the numbers together, and all the variables
-1v+54=0
We move all terms containing v to the left, all other terms to the right
-v=-54
v=-54/-1
v=+54
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