12=r-9

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Solution for 12=r-9 equation: 



12=r-9

We move all terms to the left:

12-(r-9)=0

We get rid of parentheses

-r+9+12=0

We add all the numbers together, and all the variables

-1r+21=0

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

-r=-21

r=-21/-1

r=+21

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