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(7a-4b)(7a-4b)(7a-4b)
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(a - b)³ = a³ - 3a²b + 3ab² - b³
(7a - 4b)³ = (7a)³ - 3(7a)²(4b) + 3(7a)(4b)² - (4b)³
= 343a³ - 588a²b + 84ab² - 64b³ Ans.
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