[IMPORTANT] Bonsoir,

Comment résoudre f(x)=7 quand f(x)= |x+1|+|x-1|-2
Sachant que moi j'ai déjà fait : |x+1|+|x-1|-2 = 7
|x+1|+|x-1| = 9

Mais après je sais pas comment faire...
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