5a - [4b-{7a- (3c-2b) +4c-3(a+3b-2c)}]
(simplify) (algebra sum)
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5a-4b-7a-3c+14ab+4c-3a-9ab+6c
=14ab-9ab-7a+5a+6c-3c+4c-4b
=5ab-2a+7c-4b is the best answer for the question
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