bonjour
1) 3x + 5x = x ( 8 )
2) 8y2 - 5y = y ( 8 y - 5 )
3) 2 (x-1)-(x-1) (3x + 3) = ( x - 1 ) ( 2 - 3 x - 3 ) = ( x - 1 ) ( - 3 x - 1 )
4) (2x - 1) (3x + 1) + (2x - 1) (5 - 2x) = ( 2 x - 1 ) ( 3 x + 1 + 5 - 2 x ) = ( 2 x - 1 ) ( x + 6 )
5) (x + 1)2 + (x + 1)(2x - 3) = ( x + 1 ) ( x + 1 + 2 x - 3 ) = ( x + 1 ) ( 3 x - 2 )
