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Two new methods for the computation of solutions to regular discrete-time linear systems are presented. The first of them is an extension of the Diasesquista method for regular discrete-time linear systems. The other is based on an expansion in a series of the inverse matrix [Ez - A]-1. ; The methods are compared with the Weierstrass-Kronecker decomposition method and the Drazin inverse method. Relationships between the coefficient matrices of the four methods are established. A new mixed method is presented.