21=4v+5(v-3)

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



21=4v+5(v-3)

We move all terms to the left:

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



We calculate terms in parentheses: -(4v+5(v-3)), so:

4v+5(v-3)

We multiply parentheses

4v+5v-15

We add all the numbers together, and all the variables

9v-15

Back to the equation:

-(9v-15)



We get rid of parentheses

-9v+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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