Understanding a proof from the APMO 1998 on inequalities.

It is by AM-GM: $$\frac{x}{y}+\frac{x}{y}+\frac{y}{z}\geq 3\sqrt[3]{\frac{x^2y}{y^2z}}=3\sqrt[3]{\frac{x^3}{xyz}}$$

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Inequality

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A.M. G.M. Inequality

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