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40=v/3+12
We move all terms to the left:
40-(v/3+12)=0
We get rid of parentheses
-v/3-12+40=0
We multiply all the terms by the denominator
-v-12*3+40*3=0
We add all the numbers together, and all the variables
-1v+84=0
We move all terms containing v to the left, all other terms to the right
-v=-84
v=-84/-1
v=+84
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