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71.25r=7.5
We move all terms to the left:
71.25r-(7.5)=0
We add all the numbers together, and all the variables
71.25r-7.5=0
We move all terms containing r to the left, all other terms to the right
71.25r=7.5
r=7.5/71.25
r=5/47.5
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