15r+-4r+17r+-15r+-8r=-20

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Solution for 15r+-4r+17r+-15r+-8r=-20 equation: 



15r+-4r+17r+-15r+-8r=-20

We move all terms to the left:

15r+-4r+17r+-15r+-8r-(-20)=0

We add all the numbers together, and all the variables

5r=0

r=0/5

r=0

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