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

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



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

We move all terms to the left:

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



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

-7v+5(v-7)

We multiply parentheses

-7v+5v-35

We add all the numbers together, and all the variables

-2v-35

Back to the equation:

-(-2v-35)



We get rid of parentheses

2v+35-21=0

We add all the numbers together, and all the variables

2v+14=0

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

2v=-14

v=-14/2

v=-7

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