21=9v-6v

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Solution for 21=9v-6v equation: 



21=9v-6v

We move all terms to the left:

21-(9v-6v)=0

We add all the numbers together, and all the variables

-(+3v)+21=0

We get rid of parentheses

-3v+21=0

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

-3v=-21

v=-21/-3

v=+7

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