bonjour

2 x + 3 = 4

2 x = 4 - 3

2 x = 1

x = 1 /2

2 x + 6 = 0

2 x = - 6

x = - 6/2 = - 3

-3 x + 64 = 19

- 3 x = 19 - 64

- 3 x = - 45

x = - 15

x² - 4 = 0

( x - 2 ) ( x + 2 ) = 0

x = 2 ou - 2

3 x - 4 < 8

3 x < 8 + 4

3 x < 12

x < 4

9 x - 5 < 5 x - 1

9 x - 5x < - 1 + 5

4 x < 4

x < 1

6 x - 7 < 7 x + 5

6 x - 7 x < 5 + 7

- x < 12

x >  - 12

continue, je t'ai fait les 2 cas possibles