-81=-9+-4v

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Solution for -81=-9+-4v equation: 



-81=-9+-4v

We move all terms to the left:

-81-(-9+-4v)=0

We add all the numbers together, and all the variables

-(-4v)-81=0

We get rid of parentheses

4v-81=0

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

4v=81

v=81/4

v=20+1/4

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