2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/62744We prove that the well-known 3/2 stability condition established for the Wright equation (WE) still holds if the nonlinearity $p(\exp(-x)-1)$ in WE is replaced by a decreasing or unimodal smooth function f with $f'(0)<0$ satisfying the standard negative feedback and below boundedness conditions and having everywhere negative Schwarz derivative.12 pages, 1 figure. Some references and comments added to the previous version. Accepted for publication in Discrete and continuous Dynamical SystemsDynamical Systems34K20, 92D25text