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Sagot :

SWNN
- x + 9 = - (-2)
- x + 9 = 2
- x = 2 - 9
- x = -7
x = 7




3x - 3 = -18
3x = -18 + 3
3x = -15
x = -15/3
x = -5

Réponse :

-x= +2 -9

-x= -7

x=7

3x=-18+3

x= -15/3

x=-5

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