[tex]bonjour\\\\4 x - 8 = 12 \\4 x = 12 + 8 \\4 x = 20 \\x = 5 \\\\7 x = 5 x - 15 \\7 x - 5 x = 15 \\2 x = 15 \\x = 15/2 \\\\3 x + 2 = x - 10 \\3 x - x = - 10 - 2 \\2 x = - 12 \\x = - 6 \\\\3 - 6 x = 5 x - 1 \\- 6 x - 5 x = - 1 - 3 \\- 11 x = - 4 \\x = 4/11[/tex]
bonne journée