Bonjour !
[tex]7x = -3 \iff x = - \frac{3}{7} [/tex]
[tex]5x - 3 = 11 \\ \iff 5x = 14 \\ \iff x = \frac{14}{5} [/tex]
- [tex]3x + 7 = 5x - 18[/tex]
[tex]3x + 7 = 5x - 18 \\ \iff - 2x + 7 = - 18 \\ \iff - 2x = - 25 \\ \iff \: x = \frac{25}{2} [/tex]
Bonne soirée
