2a-3b-[4a-3b-{a-2c-(a-2b-c)}]
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-2a+2b-c
Step-by-step explanation:
2a-3b-[4a-3b-{a-2c-(a-2b-c) }]
2a-3b--[4a-3b-a+2c+a-2b-c]
2a-3b-4a+3b+a-2c+a-2b-c
2a-4a+a-a-3b+3b+2b-2c+c
-2a+2b-c
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