Question

12-{15:3+2. [7+5-4-6. (-7)]}

Answer 1

12-{15:3+2. [7+5-4-6. (-7)]}
12 - { 15 : 3 + 2 . [ 7 + 5 - 4 - 6 . -7 ]}
12 - { 5 + 2 . [ 7 + 5 - 4 + 42 ]}
12 - { 5 + 2 . [ 54 - 4]}
12 - { 5 + 2 .50}
12 - 5 + 100
7 + 100
107