Пошаговое объяснение:

(AD + DB – CB) – ( ME – CE)=

=(AB – CB) – ( ME – CE)=

=(AB +ВС) – ( ME – CE)=

=AС – ( ME – CE)=

=AС – ME + CE=

=АЕ-МЕ=АЕ+ЕМ=АМ.