-11=9+r

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Solution for -11=9+r equation: 



-11=9+r

We move all terms to the left:

-11-(9+r)=0

We add all the numbers together, and all the variables

-(r+9)-11=0

We get rid of parentheses

-r-9-11=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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