Respuesta:
2 . [ - 3 - (-4+3 ) : ( -1 ) ] - [ ( -2 + 8 ) : ( -3 ) ]=
= 2 . ( -3 + ( -4 ) ) - ( -2 ) =
= 2 . ( -7 ) + 2 =
= -14 + 2 =
= -12