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y: 2do numero
x + y = 4 → y = 4-x
1/x + 1/y = 4/15
1/x + 1/(4-x) = 15
(4-x + x) / x(4-x) = 15
4 = 15x(4-x)
60x - 15x² = 4
15x² - 60x + 4 = 0
RESUELVES POR FORMULA GENERAL Y HALLAS LOS NUMEROS.