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Sagot :

bonjour

3x-7x = -5-9

-4x=-14

x=14/4

x=3,5

PIDIO

Bonjour !

[tex]3x + 9 = 7x - 5 \\ - 4x + 9 = - 5 \\ - 4x = - 14 \\ x = \frac{ - 14}{ - 4} = \frac{7}{2} [/tex]

Bonne journée

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