0=-r-2r

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Solution for 0=-r-2r equation: 



0=-r-2r

We move all terms to the left:

0-(-r-2r)=0

We add all the numbers together, and all the variables

-(-3r)+0=0

We add all the numbers together, and all the variables

-(-3r)=0

We get rid of parentheses

3r=0

r=0/3

r=0

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