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-(+r)=0

We get rid of parentheses

r-r=0

We add all the numbers together, and all the variables

=0

r=0/1

r=0

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