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17r+3r-15r-5r+3r=9
We move all terms to the left:
17r+3r-15r-5r+3r-(9)=0
We add all the numbers together, and all the variables
3r-9=0
We move all terms containing r to the left, all other terms to the right
3r=9
r=9/3
r=3
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