21=9-4v

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Solution for 21=9-4v equation: 



21=9-4v

We move all terms to the left:

21-(9-4v)=0

We add all the numbers together, and all the variables

-(-4v+9)+21=0

We get rid of parentheses

4v-9+21=0

We add all the numbers together, and all the variables

4v+12=0

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

4v=-12

v=-12/4

v=-3

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