9=r-11

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Solution for 9=r-11 equation: 



9=r-11

We move all terms to the left:

9-(r-11)=0

We get rid of parentheses

-r+11+9=0

We add all the numbers together, and all the variables

-1r+20=0

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

-r=-20

r=-20/-1

r=+20

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