(6)
-12-[-8-9-{-7+ (-9+4) + 5} + 4]
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Answer:
-12-[-8-9-{-7-5+5}+4]
= -12-[-8-9-{-12+5}+4]
=-12-[-8-9-7+4]
= -12-[-17-3]
=-12-20
=-32
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