91=-5-8(r-8)

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Solution for 91=-5-8(r-8) equation: 



91=-5-8(r-8)

We move all terms to the left:

91-(-5-8(r-8))=0



We calculate terms in parentheses: -(-5-8(r-8)), so:

-5-8(r-8)

determiningTheFunctionDomain
-8(r-8)-5

We multiply parentheses

-8r+64-5

We add all the numbers together, and all the variables

-8r+59

Back to the equation:

-(-8r+59)



We get rid of parentheses

8r-59+91=0

We add all the numbers together, and all the variables

8r+32=0

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

8r=-32

r=-32/8

r=-4

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