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Meilleure réponse !
2014-06-02T11:33:22+02:00
Exercice 22 :

9 (7 + x) = 63 + 9x
7 (x - 9) = 7x - 63
(x + 9) * 7 = 7x + 63
(7 - x) * 9 = 63 - 9x
2014-06-02T11:35:54+02:00
9(7+x) = 63+9x
7(x-9) = 7x-63
(x+9)x7 = 7x+63
(7-x)x9 = 63-9x