9y-63= 9X1y - 9X7 = 9(y-7)
12y-42=6X2y- 6X7 = 6(2y-7)... j’espère tu as compris la méthode
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9y-63= 9X1y - 9X7 = 9(y-7)
12y-42=6X2y- 6X7 = 6(2y-7)... j’espère tu as compris la méthode