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Sagot :

Réponse :

( -5 + 3x ) - ( -9 ) = 4

45 + 27x = 4

27x = 4 - 45

27x = - 41

x = -41/27

( - 9 - x ) - ( - 6 ) = 22

-54 - 6x = 22

-6x = 22+54

-6x = 76

x = 76/-6

x = - 12, 6 environ

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