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12=3+v/3
We move all terms to the left:
12-(3+v/3)=0
We add all the numbers together, and all the variables
-(v/3+3)+12=0
We get rid of parentheses
-v/3-3+12=0
We multiply all the terms by the denominator
-v-3*3+12*3=0
We add all the numbers together, and all the variables
-1v+27=0
We move all terms containing v to the left, all other terms to the right
-v=-27
v=-27/-1
v=+27
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