Apply df_sub__df_neg__df_div__df_nn__df_2__df_3__df_4__df_5__df_6__df_7__df_8__df_9__df_10OLD__df_n0__df_xnn0__df_z__df_dec__df_uz with
wceq cn (cima (crdg (cmpt (λ x0 . cvv) (λ x0 . co (cv x0) c1 caddc)) c1) com).
The subproof is completed by applying H3.