90=5(r-71)

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Solution for 90=5(r-71) equation: 



90=5(r-71)

We move all terms to the left:

90-(5(r-71))=0



We calculate terms in parentheses: -(5(r-71)), so:

5(r-71)

We multiply parentheses

5r-355

Back to the equation:

-(5r-355)



We get rid of parentheses

-5r+355+90=0

We add all the numbers together, and all the variables

-5r+445=0

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

-5r=-445

r=-445/-5

r=+89

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