21+4v=7v

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Solution for 21+4v=7v equation: 



21+4v=7v

We move all terms to the left:

21+4v-(7v)=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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