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Y = Sueldo del segundo empleado
X - Y = 240000 (Ecuacion 1)
X/Y = 7/3
X = 7Y/3 (Ecuacion 2)
Reemplazo X = 7Y/3 en: X - Y = 240000
7Y/3 - Y = 240000
7Y/3 - Y = 7Y/3 - 3Y/3 = 4Y/3
4Y/3 = 240000
4Y = 3(240000)
4Y = 720000
Y = 180000
Reemplazo el valor de Y en X = 7Y/3
X = 7(180000)/3
X = 1260000/3
X = 420000
El primer empleado gana $420000
El segundo empleado gana $180000
Prueba: 420000 - 180000 = $240000