90=6(2r-1)

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Solution for 90=6(2r-1) equation: 



90=6(2r-1)

We move all terms to the left:

90-(6(2r-1))=0



We calculate terms in parentheses: -(6(2r-1)), so:

6(2r-1)

We multiply parentheses

12r-6

Back to the equation:

-(12r-6)



We get rid of parentheses

-12r+6+90=0

We add all the numbers together, and all the variables

-12r+96=0

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

-12r=-96

r=-96/-12

r=+8

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