r-2r=-r

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Solution for r-2r=-r equation: 



r-2r=-r

We move all terms to the left:

r-2r-(-r)=0

We add all the numbers together, and all the variables

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

We add all the numbers together, and all the variables

-1r-(-1r)=0

We get rid of parentheses

-1r+1r=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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