84=21+3v

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Solution for 84=21+3v equation: 



84=21+3v

We move all terms to the left:

84-(21+3v)=0

We add all the numbers together, and all the variables

-(3v+21)+84=0

We get rid of parentheses

-3v-21+84=0

We add all the numbers together, and all the variables

-3v+63=0

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

-3v=-63

v=-63/-3

v=+21

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