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-17r+20r-11r+5r+17=20
We move all terms to the left:
-17r+20r-11r+5r+17-(20)=0
We add all the numbers together, and all the variables
-3r-3=0
We move all terms containing r to the left, all other terms to the right
-3r=3
r=3/-3
r=-1
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