72=9(r-91)

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Solution for 72=9(r-91) equation: 



72=9(r-91)

We move all terms to the left:

72-(9(r-91))=0



We calculate terms in parentheses: -(9(r-91)), so:

9(r-91)

We multiply parentheses

9r-819

Back to the equation:

-(9r-819)



We get rid of parentheses

-9r+819+72=0

We add all the numbers together, and all the variables

-9r+891=0

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

-9r=-891

r=-891/-9

r=+99

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