13r-8r+5r-9r=20

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Solution for 13r-8r+5r-9r=20 equation: 



13r-8r+5r-9r=20

We move all terms to the left:

13r-8r+5r-9r-(20)=0

We add all the numbers together, and all the variables

r-20=0

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

r=20

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