Réponse :
bonjour
[tex]2 x + 9 = 0\\2 x = - 9 \\x = - 9/2 = - 4.5\\\\5 - 4 x = 0 \\- 4 x = - 5 \\x = 5/4 = 1.25 \\\\6 x - 7 = 0\\6 x = 7\\x = 7/6 \\\\- 8 - 3 x = 0 \\- 3 x = 8 \\x = - 8/3\\\\6 x + 42 = 0 \\6 x = - 42\\x = - 42/6 = - 7[/tex]
[tex]5 - 2.5 x = 0\\- 2.5 x = - 5\\x = 5/2.5 = 2 \\\\7 x - 1 = 0 \\7 x = 1\\x = 1/7 \\\\\\- 8 x - 8 = 0 \\- 8 x = 8 \\x = - 1 \\\\[/tex]
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