r-9-19r=13-20r

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Solution for r-9-19r=13-20r equation: 



r-9-19r=13-20r

We move all terms to the left:

r-9-19r-(13-20r)=0

We add all the numbers together, and all the variables

r-19r-(-20r+13)-9=0

We add all the numbers together, and all the variables

-18r-(-20r+13)-9=0

We get rid of parentheses

-18r+20r-13-9=0

We add all the numbers together, and all the variables

2r-22=0

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

2r=22

r=22/2

r=11

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