13r-3r=-20

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Solution for 13r-3r=-20 equation: 



13r-3r=-20

We move all terms to the left:

13r-3r-(-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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