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( x² - 3x) ( x + 3 )
x³ + 3x² - 3x² - 9x
x³ - 9x
x ( x² - 9 )
x [ ( x + 3 ) ( x - 3 ) ]
(X² - 3X) (x+3)
X³ - 3x² +3x² - 9X
X³ - 9x