21=-7v+5(v+5)

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Solution for 21=-7v+5(v+5) equation: 



21=-7v+5(v+5)

We move all terms to the left:

21-(-7v+5(v+5))=0



We calculate terms in parentheses: -(-7v+5(v+5)), so:

-7v+5(v+5)

We multiply parentheses

-7v+5v+25

We add all the numbers together, and all the variables

-2v+25

Back to the equation:

-(-2v+25)



We get rid of parentheses

2v-25+21=0

We add all the numbers together, and all the variables

2v-4=0

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

2v=4

v=4/2

v=2

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