-418 - { -418 - [ -418 - ( -418 + 2003 ) ] }
= -418 - [ -418 - ( -418 + 418 - 2003 ) ]
= -418 - [ -418 - ( -2003 ) ]
= -418 - ( -418 + 2003 )
= -418 + 418 - 2003
= 0 - 2003
= -2003.
-418-{-418-[-418-(-418+2003)]}=-418+418+[-418-(-418+2003)]=-418-(-418+2003)=-418+418-2003=-2003