-a-[a+{a+b-2a-{a-c-(a-2b)}]
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=-a-[a+{a+b-2a-{a-c-(a-2b)}]
=-a-[a+{a+b-2a-(a-c-a+2b)}]
=-a-[a+{a+b-2a-(-c+2b)}]
=-a-[a+{a+b-2a+c-2b}]
=-a-[a-a-b+c]
=-a+b-c
Correct me if I'm wrong.
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