Réponse :
(-6/7)+(2/9)= (-6*9)/(7*9) + (2*7)/(9*7)= (-54/63)+(14/63)= -40/63
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Réponse :
(-6/7)+(2/9)= (-6*9)/(7*9) + (2*7)/(9*7)= (-54/63)+(14/63)= -40/63