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x/y = 7/3
Luego R = (x² + y²)/(x² - y²); dividimos todo por y²
R = (x²/y² + 1)/(x²/y² - 1) = (49/9 + 1)/(49/9-1) = (58/9) / (40/9) = 58/40
Finalmente R = 29/20
Saludos Herminio