Réponse :
[tex]bonjour\\\\\\3 x + 8 = 7 x - 5 \\3 x - 7 x = - 5 - 8\\- 4 x = - 13 \\x = 13/4 \\\\\\9 - x = 6 x + 8\\- x - 6 x = 8 - 9\\- 7 x = - 1 \\x = 1/7 \\\\\\3 x - 11 = 6 x - 1 \\3 x - 6 x = - 1 + 11 \\- 3 x = 10 \\x = - 10/3 \\\\\\8 x + 5 = 9 x - 6 \\8 x - 9 x = - 6 - 5 \\- x = - 11 \\x = 11 \\\\\\31 x + 11 = 3 - x \\31 x + x = 3 - 11 \\32 x = - 8 \\x = - 8/32 = - 1 /4 \\\\15 x - 17 = 8 x - 1 \\15 x - 8 x = - 1 + 17\\7 x = 16 \\x = 16/7 \\\\[/tex]
allez finis
Explications étape par étape :
