Réponse:
(1/3)+(2/7)+x+(1/4)=1
1/3 +2/7 +1/4 +x=1
(28+24+21)/84 +x=1
73/84 +x=1
x=1-73/84
x =11//84
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Réponse:
(1/3)+(2/7)+x+(1/4)=1
1/3 +2/7 +1/4 +x=1
(28+24+21)/84 +x=1
73/84 +x=1
x=1-73/84
x =11//84