-9+-9v=-90

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Solution for -9+-9v=-90 equation: 



-9+-9v=-90

We move all terms to the left:

-9+-9v-(-90)=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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