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

-(-1r-2)+9=0

We get rid of parentheses

1r+2+9=0

We add all the numbers together, and all the variables

r+11=0

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

r=-11

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