-9=2+r

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Solution for -9=2+r equation: 



-9=2+r

We move all terms to the left:

-9-(2+r)=0

We add all the numbers together, and all the variables

-(r+2)-9=0

We get rid of parentheses

-r-2-9=0

We add all the numbers together, and all the variables

-1r-11=0

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

-r=11

r=11/-1

r=-11

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