If you share a (chapter and exercise number, or the problem text in Spanish), I will gladly solve it and explain the reasoning.
It seems you are looking for the (Solucionario) for "Investigación de Operaciones" by Hamdy A. Taha , 5th Edition (Spanish version of Operations Research: An Introduction ). Solucionario Investigacion De Operaciones Taha 5 Edicionl