bonjour
A = ( y - 2 ) ( 3 y + 4 - 2 y - 3 )
A = ( y - 2 ) ( y + 1 )
B = ( 2 a - 1 ) ( 5 a - 1 + a - 3 )
B = ( 2 a - 1 ) ( 6 a - 4 )
B = 2 ( 2 a - 1 ) ( 3 a - 2 )
C = ( 3 x + 1 ) ( x - 3 + 3 x + 1 )
C = ( 3 x + 1 ) ( 4 x - 2 )
C = - 2 ( 3 x + 1 ) ( - 2 x + 1 )
