System of equations..

Algebra Level 3

{x+yxy+xyx+y=52x2+y2=90\large \begin{cases} \dfrac{x+y}{x-y} + \dfrac{x-y}{x+y} = \dfrac 52 \\ x^2+y^2 = 90 \\ \end{cases}

Find the minimum value of yxy-x

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