20=5(r-90)

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Solution for 20=5(r-90) equation: 



20=5(r-90)

We move all terms to the left:

20-(5(r-90))=0



We calculate terms in parentheses: -(5(r-90)), so:

5(r-90)

We multiply parentheses

5r-450

Back to the equation:

-(5r-450)



We get rid of parentheses

-5r+450+20=0

We add all the numbers together, and all the variables

-5r+470=0

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

-5r=-470

r=-470/-5

r=+94

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