13r+5r-8r=20

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Solution for 13r+5r-8r=20 equation: 



13r+5r-8r=20

We move all terms to the left:

13r+5r-8r-(20)=0

We add all the numbers together, and all the variables

10r-20=0

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

10r=20

r=20/10

r=2

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