3-(5-9)=3-5+9=7
(79-100)-15=79-100-15=-36
-111-234+111=-111+111-234=-234
45+(-6+87)=45-6+87=126
-1236+(1236-2367)=1236-1236-2367=
-2367
3-(5-9)=3-5+9=7
(79-100)-15=79-100-15=-36
-111-234+111=-111+111-234=-234
45+(-6+87)=45-6+87=126
-1236+(1236-2367)=1236-1236-2367=
-2367