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5r-4=r+17
We move all terms to the left:
5r-4-(r+17)=0
We get rid of parentheses
5r-r-17-4=0
We add all the numbers together, and all the variables
4r-21=0
We move all terms containing r to the left, all other terms to the right
4r=21
r=21/4
r=5+1/4
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