80=8(r-81)

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Solution for 80=8(r-81) equation: 



80=8(r-81)

We move all terms to the left:

80-(8(r-81))=0



We calculate terms in parentheses: -(8(r-81)), so:

8(r-81)

We multiply parentheses

8r-648

Back to the equation:

-(8r-648)



We get rid of parentheses

-8r+648+80=0

We add all the numbers together, and all the variables

-8r+728=0

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

-8r=-728

r=-728/-8

r=+91

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