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(18 - x²) - ( 6x³ + 2x² + 2 + 1)
(18 - x²) - (6x³ + 2x² + 3)
18 - x² - 6x³ - 2x² - 3
18 - 3 - x² - 2x² - 6x³
15 - 3x² - 6x³