-3=r-2r

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Solution for -3=r-2r equation: 



-3=r-2r

We move all terms to the left:

-3-(r-2r)=0

We add all the numbers together, and all the variables

-(-1r)-3=0

We get rid of parentheses

1r-3=0

We add all the numbers together, and all the variables

r-3=0

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

r=3

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