-21=7(v-8)-2v

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Solution for -21=7(v-8)-2v equation: 



-21=7(v-8)-2v

We move all terms to the left:

-21-(7(v-8)-2v)=0



We calculate terms in parentheses: -(7(v-8)-2v), so:

7(v-8)-2v

We add all the numbers together, and all the variables

-2v+7(v-8)

We multiply parentheses

-2v+7v-56

We add all the numbers together, and all the variables

5v-56

Back to the equation:

-(5v-56)



We get rid of parentheses

-5v+56-21=0

We add all the numbers together, and all the variables

-5v+35=0

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

-5v=-35

v=-35/-5

v=+7

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