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Sagot :

Bonjour,

43x

17 (x-1)  = 17x -17

40*1,5  =60

( 100 -43-17=40)

43x + 17x-17  +60 = 523

60x = 523 +17-60

60x = 480

x= 480/60 =>  8€ le porte-clé

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