2a-[4b-{4a-3(2a-b)}]
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2a-[4b-{4a-3(2a-b)}]
=2a-[4b-{4a-6a+3b}]
= 2a-[4b-{-2a+3b}]
= 2a-[4b+2a-3b]
= 2a -[b+2a]
= 2a - b - 2a
= -b
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