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8r/5=9
We move all terms to the left:
8r/5-(9)=0
We multiply all the terms by the denominator
8r-9*5=0
We add all the numbers together, and all the variables
8r-45=0
We move all terms containing r to the left, all other terms to the right
8r=45
r=45/8
r=5+5/8
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