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

-1v+21=0

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

-v=-21

v=-21/-1

v=+21

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