2a-9b-[6a-5b+{7a-12b-(2a-3b-4c)}]
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2a-9b-[6a-5b+{7a-12b-(2a-3b-4c)}]
Solution:
= 2a-9b-[6a-5b+{7a-12b-2a+3b+4c)}]
= 2a-9b-[6a-5b+{5a-9b+4c}]
= 2a-9b-[6a-5b+5a-9b+4c]
= 2a-9b-[11a-14b+4c]
= 2a-9b-11a+14b-4c
= -9a+5b-4c
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