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E = 9 x² - 6 x + 1 -  ( 1 - x ) ( 3 x - 1 )

E = ( 3 x  - 1 )²  - ( 1 - x ) ( 3 x - 1 )

E = ( 3 x - 1 ) ( 3 x - 1  - 1 + x )

E =( 3 x - 1 ) ( 4 x - 2 )

E = 2 ( 3 x - 1 ) ( 2 x - 1 )

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