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17r-17r+4r+4r-4r=8
We move all terms to the left:
17r-17r+4r+4r-4r-(8)=0
We add all the numbers together, and all the variables
4r-8=0
We move all terms containing r to the left, all other terms to the right
4r=8
r=8/4
r=2
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