-21=3v-1+7v

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Solution for -21=3v-1+7v equation: 



-21=3v-1+7v

We move all terms to the left:

-21-(3v-1+7v)=0

We add all the numbers together, and all the variables

-(10v-1)-21=0

We get rid of parentheses

-10v+1-21=0

We add all the numbers together, and all the variables

-10v-20=0

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

-10v=20

v=20/-10

v=-2

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