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a = 2b sub ke a^3 - 4 a^2b + 3 ab^2 - b^3
= (2b)^3 - 4 (2b)^2.b + 3(2b)(b^2) - b^3
= 8b^3 - 16 b^3 + 6b^3 - b^3
= (8-16+6-1)b^3
= - 3b^3