How do I get from the problem on the left side to the next step on the ride side?
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Treat $\displaystyle -\frac{2xy^2}{y^4}$ and $\displaystyle \frac{2x^2y}{y^4} \left(\frac{-x^2}{y^2}\right)$ as seperate terms first. Expand the second one and then make a common denominator.
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