Question

-(7-3)-(5-2)-[(12-6)-(9-5)]
-4-3- [6-4]
-4-3-2
-4-1
5

Answer 1

-(7-3)-(5-2)-[(12-6)-(9-5)]
-12-6-4≡-22
-4-3- [6-4]
≡-9
-4-3-2
≡-9
-4-1
≡-5

y si es todo
-22-9-9-5≡-45