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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