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Pregunta 5 del día 3 (dificultad 3): Fue una pregunta relativamente compleja que me llevó varios intentos completarla. En esta pregunta se utilizaron los conceptos de programación orientada a objetos junto con algunos métodos especiales. Inicialmente estaba cometiendo un error con el método de substraer pero lo rectifiqué y lo solucioné. Ahora mi solución pasa todos los casos de prueba.