-r-9r=80

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Solution for -r-9r=80 equation: 



-r-9r=80

We move all terms to the left:

-r-9r-(80)=0

We add all the numbers together, and all the variables

-10r-80=0

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

-10r=80

r=80/-10

r=-8

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