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

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



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

We move all terms to the left:

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

We add all the numbers together, and all the variables

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



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

-3(3v-7)

We multiply parentheses

-9v+21

Back to the equation:

-(-9v+21)



We get rid of parentheses

3v+9v-21+21=0

We add all the numbers together, and all the variables

12v=0

v=0/12

v=0

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