84=3(3+5r)

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Solution for 84=3(3+5r) equation: 



84=3(3+5r)

We move all terms to the left:

84-(3(3+5r))=0

We add all the numbers together, and all the variables

-(3(5r+3))+84=0



We calculate terms in parentheses: -(3(5r+3)), so:

3(5r+3)

We multiply parentheses

15r+9

Back to the equation:

-(15r+9)



We get rid of parentheses

-15r-9+84=0

We add all the numbers together, and all the variables

-15r+75=0

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

-15r=-75

r=-75/-15

r=+5

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