90=9(r-82)

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Solution for 90=9(r-82) equation: 



90=9(r-82)

We move all terms to the left:

90-(9(r-82))=0



We calculate terms in parentheses: -(9(r-82)), so:

9(r-82)

We multiply parentheses

9r-738

Back to the equation:

-(9r-738)



We get rid of parentheses

-9r+738+90=0

We add all the numbers together, and all the variables

-9r+828=0

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

-9r=-828

r=-828/-9

r=+92

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