Simplify the expression using ONLY positive exponents

Panama said:
r^ -1- 4s^ -1
___________
5s - 20r

\(\displaystyle \frac{r^{-1} \, - \, 4s^{-1}}{5s \, - \, 20r}\)

\(\displaystyle \frac{\frac{1}{r} \, - \, \frac{4}{s}}{5s \, - \, 20r}\)

Now continue....
 
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