factorise: 343-27b^3
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343 - 27b^3
= (7-3b) . (49 + 21b + 9b^2)
= (7)^3 - 3 . (7) . (3b) . (7-3b) - (3b)^3
= 343 - 63b (7-3b) - 27b^3
= 343 - 441b - 189b^2 - 27b^3
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