9=r-9

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Solution for 9=r-9 equation: 



9=r-9

We move all terms to the left:

9-(r-9)=0

We get rid of parentheses

-r+9+9=0

We add all the numbers together, and all the variables

-1r+18=0

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

-r=-18

r=-18/-1

r=+18

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