21=3(v-3)-8v

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Solution for 21=3(v-3)-8v equation: 



21=3(v-3)-8v

We move all terms to the left:

21-(3(v-3)-8v)=0



We calculate terms in parentheses: -(3(v-3)-8v), so:

3(v-3)-8v

We add all the numbers together, and all the variables

-8v+3(v-3)

We multiply parentheses

-8v+3v-9

We add all the numbers together, and all the variables

-5v-9

Back to the equation:

-(-5v-9)



We get rid of parentheses

5v+9+21=0

We add all the numbers together, and all the variables

5v+30=0

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

5v=-30

v=-30/5

v=-6

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