9+r=-2r

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Solution for 9+r=-2r equation: 



9+r=-2r

We move all terms to the left:

9+r-(-2r)=0

We get rid of parentheses

r+2r+9=0

We add all the numbers together, and all the variables

3r+9=0

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

3r=-9

r=-9/3

r=-3

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