v=21-2v

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Solution for v=21-2v equation: 



v=21-2v

We move all terms to the left:

v-(21-2v)=0

We add all the numbers together, and all the variables

v-(-2v+21)=0

We get rid of parentheses

v+2v-21=0

We add all the numbers together, and all the variables

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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