30=10(r-90)

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Solution for 30=10(r-90) equation: 



30=10(r-90)

We move all terms to the left:

30-(10(r-90))=0



We calculate terms in parentheses: -(10(r-90)), so:

10(r-90)

We multiply parentheses

10r-900

Back to the equation:

-(10r-900)



We get rid of parentheses

-10r+900+30=0

We add all the numbers together, and all the variables

-10r+930=0

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

-10r=-930

r=-930/-10

r=+93

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