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Sagot :

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( 9 x - 4 ) ( 2 x + 1 ) +   ( 9 x - 4 )

= ( 9 x  - 4 ) ( 2 x + 1 + 1 )

= ( 9 x  - 4 ) ( 2 x + 2 )

= 2 ( 9 x - 4 )  ( x + 1 )

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