81=13v-4v

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Solution for 81=13v-4v equation: 



81=13v-4v

We move all terms to the left:

81-(13v-4v)=0

We add all the numbers together, and all the variables

-(+9v)+81=0

We get rid of parentheses

-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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