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(2x)³- 3(2x)²(6y³) + 3(2x)(6y³)² - (6y³)³=
8x³ - 3(4x²)(6y³) + 3(2x)(36y^6) - 216y^9=
8x³ - 72x²y³ + 216xy^6 - 216y^9