r=-13-2r

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Solution for r=-13-2r equation: 



r=-13-2r

We move all terms to the left:

r-(-13-2r)=0

We add all the numbers together, and all the variables

r-(-2r-13)=0

We get rid of parentheses

r+2r+13=0

We add all the numbers together, and all the variables

3r+13=0

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

3r=-13

r=-13/3

r=-4+1/3

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