-80=-10(r-1)

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Solution for -80=-10(r-1) equation: 



-80=-10(r-1)

We move all terms to the left:

-80-(-10(r-1))=0



We calculate terms in parentheses: -(-10(r-1)), so:

-10(r-1)

We multiply parentheses

-10r+10

Back to the equation:

-(-10r+10)



We get rid of parentheses

10r-10-80=0

We add all the numbers together, and all the variables

10r-90=0

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

10r=90

r=90/10

r=9

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