bonjour
8 x + 6 = 2 ( 4 x + 3 )
8 x + 6 x = 2 x ( 4 + 3 ) = 14 x
8 x² + 6 x = 2 x ( 4 x + 3 )
x² + 8 x = x ( x + 8 )
x + 8 x² = x ( 1 + 8 x )
5 x + 15 = 5 ( x + 3 )
7 y² - 2 y = y ( 7 y - 2 )
a - 5 a² = a ( 1 - 5 a )
3 x + x² = x ( 3 + x )
( 5 - 7 x ) ( 6 + x ) + ( 5 - 7 x ) ( 3 x + 4 )
= ( 5 - 7 x ) ( 6 + x + 3 x +4 )
= ( 5 - 7 x ) ( 4 x + 10 )
= 2 ( 5 - 7 x ) ( 2 x + 5 )
