7a-[8a-{11a-(12a-6a+5a)}]
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Answer:
7a-[8a-{11a-(12a-6a+5a)}]
=7a-[8a-{11a-(12a-11a)}]
=7a-[8a-{11a-a}]
=7a-[8a-10a]
=7a-(-2a)
=7a+2a
=9a
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