13=11-3r

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Solution for 13=11-3r equation: 



13=11-3r

We move all terms to the left:

13-(11-3r)=0

We add all the numbers together, and all the variables

-(-3r+11)+13=0

We get rid of parentheses

3r-11+13=0

We add all the numbers together, and all the variables

3r+2=0

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

3r=-2

r=-2/3

r=-2/3

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