8v-21=-3(7-7v)

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Solution for 8v-21=-3(7-7v) equation: 



8v-21=-3(7-7v)

We move all terms to the left:

8v-21-(-3(7-7v))=0

We add all the numbers together, and all the variables

8v-(-3(-7v+7))-21=0



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

-3(-7v+7)

We multiply parentheses

21v-21

Back to the equation:

-(21v-21)



We get rid of parentheses

8v-21v+21-21=0

We add all the numbers together, and all the variables

-13v=0

v=0/-13

v=0

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