90=5(3r-3)

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Solution for 90=5(3r-3) equation: 



90=5(3r-3)

We move all terms to the left:

90-(5(3r-3))=0



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

5(3r-3)

We multiply parentheses

15r-15

Back to the equation:

-(15r-15)



We get rid of parentheses

-15r+15+90=0

We add all the numbers together, and all the variables

-15r+105=0

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

-15r=-105

r=-105/-15

r=+7

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