Réponse:
[tex]3x + 7 = 8 \\ 3x = 8 - 7 \\ 3x = 1 \\ x = \frac{1}{3} [/tex]
[tex]9 - 2x = 7x \\ - 2x - 7x = - 9 \\ - 9x = - 9 \\ x = \frac{ - 9}{ - 9} \\ x = 1[/tex]
[tex]6x + 11 = 8 - 8x \\ 6x + 8x = 8 - 11 \\ 14x = - 3 \\ x = \frac{ - 3}{14} [/tex]
[tex]3(3x - 4) = 2x + 2 \\ 9x - 12 = 2x + 2 \\ 9x - 2x = 2 + 12 \\ 7x = 14 \\ x = \frac{14}{7} \\ x = 2[/tex]
[tex](x + 2)(x - 7) - {x}^{2} = 5(2x - 8) \\ {x}^{2} - 7x + 2x - 14 - {x}^{2} = 10x - 40 \\ - 5x - 14 = 10x - 40 \\ - 5x - 10x = - 40 + 14 \\ - 15x = - 26 \\ x = \frac{26}{15} [/tex]
Et voilà j'espère t'avoir aidé bonne soirée
