bonjour jai besoin daide pour resoudre ces equations merci ​

Réponse :

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[tex]2 x + 9 = 5 \\2 x = 5 - 9 \\2 x = - 4 \\x = - 2 \\\\\\5 - 4 x = 1 \\- 4 x = 1 - 5\\- 4 x = - 4 \\x = 1 \\\\[/tex]

6 x - 7 = 4 \\

6 x  = 4 + 7 \\

6 x = 11 \\

x = 11/6 \\

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- 8 - 3 x = 2 \\

- 3 x = 2 + 8 \\

- 3 x = 10 \\

x = - 10/3 \\

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6 x + 8 = 1 \\

6 x = 1 - 8 \\

6 x = - 7 \\

x = - 7/6 \\

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- 5 +  7 x = - 5\\

7 x = - 5 + 5 \\

7 x = 0 \\

x = 0\\

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4 - 0.1 x = - 6 \\

- 0.1 x = - 6 - 4 \\

- 0.1 x = - 10 \\

x =   100\\

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- 5.5 - 3 x = - 7.5 \\

- 3 x = - 7.5 + 5.5 \\

- 3 x = - 2 \\

x = 2 /3 \\

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Explications étape par étape :