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We formulate the Dynamical Mean Field Approximation equations for thedouble-exchange system with quenched disorder for arbitrary relation betweenHund exchange coupling and electron band width. Close to theferromagnetic-paramagnetic transition point the DMFA equations can be reducedto the ordinary mean field equation of Curie-Weiss type. We solve the equationto find the transition temperature and present the magnetic phase diagram ofthe system.Comment: 5 pages, latex, 2 eps figures. We explicitely present the magnetic  phase diagram of the syste

Ferromagnetic transition in a double-exchange system containing impurities in the Dynamical Mean-Field Approximation