21=3(v+3)-7v

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



21=3(v+3)-7v

We move all terms to the left:

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



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

3(v+3)-7v

We add all the numbers together, and all the variables

-7v+3(v+3)

We multiply parentheses

-7v+3v+9

We add all the numbers together, and all the variables

-4v+9

Back to the equation:

-(-4v+9)



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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