9=r-80

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Solution for 9=r-80 equation: 



9=r-80

We move all terms to the left:

9-(r-80)=0

We get rid of parentheses

-r+80+9=0

We add all the numbers together, and all the variables

-1r+89=0

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

-r=-89

r=-89/-1

r=+89

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