-a-[a+{a+b-2a-(a-2b)}-b]
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Step-by-step explanation:
-a-[a+{a+b-2a-(a-2b)}-b]
-a-[a+{a+b-2a-a+2b}-b]
-a-[a+3b-2a-b]
-a-2b+a
-2b
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