21=3(v-3)-6v

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Solution for 21=3(v-3)-6v equation: 



21=3(v-3)-6v

We move all terms to the left:

21-(3(v-3)-6v)=0



We calculate terms in parentheses: -(3(v-3)-6v), so:

3(v-3)-6v

We add all the numbers together, and all the variables

-6v+3(v-3)

We multiply parentheses

-6v+3v-9

We add all the numbers together, and all the variables

-3v-9

Back to the equation:

-(-3v-9)



We get rid of parentheses

3v+9+21=0

We add all the numbers together, and all the variables

3v+30=0

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

3v=-30

v=-30/3

v=-10

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