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8r-5=4r-1
We move all terms to the left:
8r-5-(4r-1)=0
We get rid of parentheses
8r-4r+1-5=0
We add all the numbers together, and all the variables
4r-4=0
We move all terms containing r to the left, all other terms to the right
4r=4
r=4/4
r=1
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