-81=-9+8r

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Solution for -81=-9+8r equation: 



-81=-9+8r

We move all terms to the left:

-81-(-9+8r)=0

We add all the numbers together, and all the variables

-(8r-9)-81=0

We get rid of parentheses

-8r+9-81=0

We add all the numbers together, and all the variables

-8r-72=0

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

-8r=72

r=72/-8

r=-9

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