21=7+2v

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Solution for 21=7+2v equation: 



21=7+2v

We move all terms to the left:

21-(7+2v)=0

We add all the numbers together, and all the variables

-(2v+7)+21=0

We get rid of parentheses

-2v-7+21=0

We add all the numbers together, and all the variables

-2v+14=0

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

-2v=-14

v=-14/-2

v=+7

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