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