-8r-20=-13r

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Solution for -8r-20=-13r equation: 



-8r-20=-13r

We move all terms to the left:

-8r-20-(-13r)=0

We get rid of parentheses

-8r+13r-20=0

We add all the numbers together, and all the variables

5r-20=0

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

5r=20

r=20/5

r=4

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