9r-20=20+13r

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



9r-20=20+13r

We move all terms to the left:

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

We add all the numbers together, and all the variables

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

We get rid of parentheses

9r-13r-20-20=0

We add all the numbers together, and all the variables

-4r-40=0

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

-4r=40

r=40/-4

r=-10

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