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