21=11v-4v

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Solution for 21=11v-4v equation: 



21=11v-4v

We move all terms to the left:

21-(11v-4v)=0

We add all the numbers together, and all the variables

-(+7v)+21=0

We get rid of parentheses

-7v+21=0

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

-7v=-21

v=-21/-7

v=+3

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