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Sagot :

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bonsoir

f (x) = x - 5

f ( - 3 ) = - 3 - 5 = - 8

x - 5 = 7

x = 12

donc  f ( 12 ) = 7

f ( 7 ) = 7 - 5 = 2

x - 5 = 4

x =  9

donc  f ( 9) = 4

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