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12v=27+9v
We move all terms to the left:
12v-(27+9v)=0
We add all the numbers together, and all the variables
12v-(9v+27)=0
We get rid of parentheses
12v-9v-27=0
We add all the numbers together, and all the variables
3v-27=0
We move all terms containing v to the left, all other terms to the right
3v=27
v=27/3
v=9
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