[tex]bonjour\\\\\\- 3 x + 8 = - 11 x - 15\\- 3 x + 11 x = - 15 - 8 \\8 x = - 23 \\x = - 23/8 \\\\\\9 x - 12 = 18 x + 1 \\9 x - 18 x = 1 + 12 \\- 9 x = 13 \\x = - 13/9 \\\\[/tex]
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[tex]bonjour\\\\\\- 3 x + 8 = - 11 x - 15\\- 3 x + 11 x = - 15 - 8 \\8 x = - 23 \\x = - 23/8 \\\\\\9 x - 12 = 18 x + 1 \\9 x - 18 x = 1 + 12 \\- 9 x = 13 \\x = - 13/9 \\\\[/tex]