81=-7(v-9)

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Solution for 81=-7(v-9) equation: 



81=-7(v-9)

We move all terms to the left:

81-(-7(v-9))=0



We calculate terms in parentheses: -(-7(v-9)), so:

-7(v-9)

We multiply parentheses

-7v+63

Back to the equation:

-(-7v+63)



We get rid of parentheses

7v-63+81=0

We add all the numbers together, and all the variables

7v+18=0

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

7v=-18

v=-18/7

v=-2+4/7

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