bonjour
x
x + 3
2 ( x + 3 )= 2 x + 6
2 x + 6 - 2 x
= 6
7/5 - 4/5 x 1/3 = 7/5 - 4/15 = 21/15 - 4/15 = 17 /15
4 x - 5 = x + 1
4 x - x = 1 + 5
3 x = 6
x = 2
on ne lit pas la puissance
( 2 x - 3 )² - ( 2 x - 3 ) ( x + 6)
= ( 2 x - 3 ) ( 2 x - 3 - x - 6 )
= ( 2 x - 3 ) ( x - 9 )