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Sagot :

VINS

bonjour

x

x + 5

3 ( x + 5 ) = 3 x + 15

3 x + 15 - 2

= 3 x + 13

f (x) = 3 x + 13

f ( 4) = 12 + 13 = 25

3 x + 13 = 4

3 x = 4 - 13

3 x = - 9

x = - 3

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