Question

45-{-2-[5+4+(6-2)-(7+3-9)+6]-7}+8

Answer 1

45-{-2-[5+4+(6-2)-(7+3-9)+6]-7}+8
45-{-2-[5+4+4-1+6]-7}+8
45-{-2- 18 - 7 } + 8
45 - (-27) + 8
45 + 27 + 8
80