Question

15-{2-[9+(5-1)-(2+8-9)+6]-7}+8

Answer 1

15-{2-[9+(5-1)-(2+8-9)+6]-7}+8

15-{2-[9+(4)-(10-9)+6]-7}+8

15-{2-[9+4-1+6]-7}+8

15-{2-[18]-7}+8

15-{2-18-7}+8

15-{-23}+8

15 + 23 + 8

46