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 - { -23 } +8=
22+8=
30