11 - [(-8) - {10 - (9-7-4)}]
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Answer:
11-[(-8)-{10-(9-7-4)}]
11-[-8-{10-(-2)}]
11-[-8-{10+2}]
11-[-8-{12}]
11-[-8-12]
11-[-20]
11+20
31 ans.
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