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Sagot :

ECTO220

Réponse :

Bonjour

[tex]e^{5x}[/tex] = [tex]\frac{e^{-x} }{e}[/tex]

⇔ [tex]e^{5x} = e^{-x-1}[/tex]

⇔ 5x = -x - 1

⇔ 6x = -1

⇔ x = [tex]-\frac{1}{6}[/tex]

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