Question

8+{-(13-12+5)+[-7-(-8+2)]}-4

Answer 1

8+{-(13-12+5)+[-7-(-8+2)]}-4
8+{-(+1+5)+[-7-(-6)]}-4
8+{-(+6)+[-7-(-6)]}-4
8+{-6+[-7+6]}-4
8+{-6+[-1]}-4
8+{-6-1}-4
8+{-7}-4
8-7-4
+1-4
-3