a-[2b-{5a-(3b-2c)}]
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Step-by-step explanation:
=a-[2b- {5a-3b+2c}]
=a-[2b-5a+3b-2c]
=a-[-5a+5b-2c]
=a+5a-5b+2c
=6a-5b+2c
Hope this helps.
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