7a-[8a-{11a-(12a-6a-5a)}]
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Answer:
it is so simple
7a-[8a-{11a-(12a-6a-5a)]}
7a-[8a-{11a-(1a)]}
7a-[8a-{11a-1a]}
7a-[8a-{10a}
7a-[8a-10a]
7a-[-2a]
7a+2a
9a
I hope this will be the correct answer.
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