7. a - [2b - {3a - (2b - 3c)}]
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Answer is 2a^2-3b+5c
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Explanation:
anwer is 4a+3c-4b we find this by using property that if a minus sign is outside of bracket so when we remove bracket we change all sign i.e. if there is - then change into + if there is + change to -
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