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-17+8r=15+4r
We move all terms to the left:
-17+8r-(15+4r)=0
We add all the numbers together, and all the variables
8r-(4r+15)-17=0
We get rid of parentheses
8r-4r-15-17=0
We add all the numbers together, and all the variables
4r-32=0
We move all terms containing r to the left, all other terms to the right
4r=32
r=32/4
r=8
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