21-12v=-15-3v

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Solution for 21-12v=-15-3v equation: 



21-12v=-15-3v

We move all terms to the left:

21-12v-(-15-3v)=0

We add all the numbers together, and all the variables

-12v-(-3v-15)+21=0

We get rid of parentheses

-12v+3v+15+21=0

We add all the numbers together, and all the variables

-9v+36=0

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

-9v=-36

v=-36/-9

v=+4

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