-90=5(2r-2)

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Solution for -90=5(2r-2) equation: 



-90=5(2r-2)

We move all terms to the left:

-90-(5(2r-2))=0



We calculate terms in parentheses: -(5(2r-2)), so:

5(2r-2)

We multiply parentheses

10r-10

Back to the equation:

-(10r-10)



We get rid of parentheses

-10r+10-90=0

We add all the numbers together, and all the variables

-10r-80=0

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

-10r=80

r=80/-10

r=-8

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