12=9-r

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Solution for 12=9-r equation: 



12=9-r

We move all terms to the left:

12-(9-r)=0

We add all the numbers together, and all the variables

-(-1r+9)+12=0

We get rid of parentheses

1r-9+12=0

We add all the numbers together, and all the variables

r+3=0

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

r=-3

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