-9=-9(10+v)

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Solution for -9=-9(10+v) equation: 



-9=-9(10+v)

We move all terms to the left:

-9-(-9(10+v))=0

We add all the numbers together, and all the variables

-(-9(v+10))-9=0



We calculate terms in parentheses: -(-9(v+10)), so:

-9(v+10)

We multiply parentheses

-9v-90

Back to the equation:

-(-9v-90)



We get rid of parentheses

9v+90-9=0

We add all the numbers together, and all the variables

9v+81=0

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

9v=-81

v=-81/9

v=-9

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