13r-31=2r-9

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Solution for 13r-31=2r-9 equation: 



13r-31=2r-9

We move all terms to the left:

13r-31-(2r-9)=0

We get rid of parentheses

13r-2r+9-31=0

We add all the numbers together, and all the variables

11r-22=0

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

11r=22

r=22/11

r=2

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