Bonjour
4 x - 5 = 7 x + 4
4 x - 7 x = 4 + 5
- 3 x = 9
x = - 3
2( 4 x - 3) - ( x + 5) = 2 x - 1
8 x - 6 - x - 5 = 2 x - 1
7 x - 2 x = - 1 + 11
5 x = 10
x = 2
3 x /4 - 1/3 = 2 x
9 x /12 - 4/12 = 24 x/12
9 x - 24 x = 4
- 15 x = 4
x = - 4/15
( x + 2) ( 10 - x ) = 0
soit x + 2 = 0 ⇔ x = - 2
soit 10 - x = 0 ⇔ x = 10