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= ( 3x² - 3x ) - ( 4x + 4 )
= 3x ( x - 1 ) - 4 ( x - 1 )
= ( 3x - 4 ) ( x - 1 )
3x² - 6x + 4 = 3x² - 6x - 2x + 4
= ( 3x² - 6x ) - ( 2x + 4 )
= 3x ( x - 2 ) -2 ( x - 2 )
= ( 3x - 2 ) ( x - 2 )