bonjour
1.5 x + 6.9 = 18.90
1.5 x = 18.90 - 6.90
1.5 x = 12
x = 8
elle a acheté 8 cartes
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bonjour
1.5 x + 6.9 = 18.90
1.5 x = 18.90 - 6.90
1.5 x = 12
x = 8
elle a acheté 8 cartes