-90=-6(r-80)

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Solution for -90=-6(r-80) equation: 



-90=-6(r-80)

We move all terms to the left:

-90-(-6(r-80))=0



We calculate terms in parentheses: -(-6(r-80)), so:

-6(r-80)

We multiply parentheses

-6r+480

Back to the equation:

-(-6r+480)



We get rid of parentheses

6r-480-90=0

We add all the numbers together, and all the variables

6r-570=0

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

6r=570

r=570/6

r=95

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