13=r/20

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Solution for 13=r/20 equation: 



13=r/20

We move all terms to the left:

13-(r/20)=0

We add all the numbers together, and all the variables

-(+r/20)+13=0

We get rid of parentheses

-r/20+13=0

We multiply all the terms by the denominator


-r+13*20=0

We add all the numbers together, and all the variables

-1r+260=0

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

-r=-260

r=-260/-1

r=+260

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