2a-[4b-{4a-(3b-2a-2b) }]
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=2a-[4b-{4a-3b+2a+2b}]
=2a-[4b-{6a-1b}]
=2a-[4b-6a+1b]
=2a-[5b-6a]
=2a-5b+6a
=8a-5b
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