21=-3v-4v

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Solution for 21=-3v-4v equation: 



21=-3v-4v

We move all terms to the left:

21-(-3v-4v)=0

We add all the numbers together, and all the variables

-(-7v)+21=0

We get rid of parentheses

7v+21=0

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

7v=-21

v=-21/7

v=-3

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