( +5-9-5+7)-[-(+8)-(+24-19-1)+10]+(-12-4+9)=
( +5-9-5+7)-[-(+8)-(+24-19-1)+10]+(-12-4+9)=
$(+5-9-5+7)-[-(+8)-(+24-19-1)+10]+(-12-4+9)$=
=$-2-[-8-(+4)+10]+(-7)$=
=$-2-[-8-4+10]-7$=
=$-2-[-2]-7$=
=$-2+2-7$=
=$-7$
( +5-9-5+7)-[-(+8)-(+24-19-1)+10]+(-12-4+9)=
= -2-[-8-4+10]-7 =
= -2+2-7 = -7