-9v+21=-4(v-9)

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Solution for -9v+21=-4(v-9) equation: 



-9v+21=-4(v-9)

We move all terms to the left:

-9v+21-(-4(v-9))=0



We calculate terms in parentheses: -(-4(v-9)), so:

-4(v-9)

We multiply parentheses

-4v+36

Back to the equation:

-(-4v+36)



We get rid of parentheses

-9v+4v-36+21=0

We add all the numbers together, and all the variables

-5v-15=0

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

-5v=15

v=15/-5

v=-3

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