Bonjour :)
[tex]2x - 3 = 7x + 4\\2x - 7x = 4 + 3\\-5x = 7\\x = \frac{7}{-5}[/tex]
[tex]7x + 9 = 5 + 2x\\7x - 2x = 5 - 9\\5x = -4\\x = \frac{-4}{5}[/tex]
[tex]7(3-2x) = 5(6x-3)\\21 - 14x = 30x - 15\\-14x - 30x = -15 - 21\\-44x = -36\\x = \frac{36}{44} = \frac{18}{22} = \frac{9}{11}[/tex]
En espérant que tu aies compris :)
Bonne fin de journée
