Simply:- 4a-[6a-{8a-(6b-4a-4b)}]
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4a-[6a-{8a-(6b-4b-4a)}]
4a-[-6a-{8a-(2b-4a)}]
4a-[6a-{8a-2b+4a}-
4a-[6a-{8a+4a-2b}]
4a-[6a-{12a-2b}]
4a-[6a-12a+2b}]
4a-[-6a+2b]
4a+6a-2b
10a-2b
2(5a-b) ans
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