-9v+21=-3(v+7)

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Solution for -9v+21=-3(v+7) equation: 



-9v+21=-3(v+7)

We move all terms to the left:

-9v+21-(-3(v+7))=0



We calculate terms in parentheses: -(-3(v+7)), so:

-3(v+7)

We multiply parentheses

-3v-21

Back to the equation:

-(-3v-21)



We get rid of parentheses

-9v+3v+21+21=0

We add all the numbers together, and all the variables

-6v+42=0

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

-6v=-42

v=-42/-6

v=+7

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