Simplify 1. 11-[(-8)-[10-(9-7-4)
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11 - [ ( - 8 ) - [ 10 - ( 9 - 7 - 4 )
- 8 - [ 10 - ( 2 - 4 ) ]
- 8 - [ 10 - ( - 2 ) ]
- 8 - ( 10 + 2 )
- 8 - 12
- 20
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