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= (x-3)³ + (x+3)²
= x³ + 3x² * (-3) + 3x*(-3)² + (-3)³ + x² + 2x * 3 + 3²
= 3x * 9 + 9 - 27 + x³ + (-9)x² + x² + 6x
= x³ - 9x² + x² + 27x + 6x -18
= x³ - 8x² + 33x - 18