12v=81+3v

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Solution for 12v=81+3v equation: 



12v=81+3v

We move all terms to the left:

12v-(81+3v)=0

We add all the numbers together, and all the variables

12v-(3v+81)=0

We get rid of parentheses

12v-3v-81=0

We add all the numbers together, and all the variables

9v-81=0

We move all terms containing v to the left, all other terms to the right

9v=81

v=81/9

v=9

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