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x2−y2=7x^{2} - y^{2} = 7 x2−y2=7 z=xyz = x^{y}z=xy x2+y2=25x^{2} + y^{2} = 25x2+y2=25 t=xyt = \frac{x}{y}t=yx
Find the value of zzz.
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