21-4v=-5(3-v)

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Solution for 21-4v=-5(3-v) equation: 



21-4v=-5(3-v)

We move all terms to the left:

21-4v-(-5(3-v))=0

We add all the numbers together, and all the variables

-4v-(-5(-1v+3))+21=0



We calculate terms in parentheses: -(-5(-1v+3)), so:

-5(-1v+3)

We multiply parentheses

5v-15

Back to the equation:

-(5v-15)



We get rid of parentheses

-4v-5v+15+21=0

We add all the numbers together, and all the variables

-9v+36=0

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

-9v=-36

v=-36/-9

v=+4

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