-90=10(r-8)

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Solution for -90=10(r-8) equation: 



-90=10(r-8)

We move all terms to the left:

-90-(10(r-8))=0



We calculate terms in parentheses: -(10(r-8)), so:

10(r-8)

We multiply parentheses

10r-80

Back to the equation:

-(10r-80)



We get rid of parentheses

-10r+80-90=0

We add all the numbers together, and all the variables

-10r-10=0

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

-10r=10

r=10/-10

r=-1

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