Aider moi svp et merci d'avance :
Soit x et y deux nombres réels tels que (x+1) (y-1) + 1 ∉ 0

On pose : a = x+2 / xy-x+y
b = (x+1)y / xy-x+y
Montrer que : (x+1) (a-b +1) =a + b-1
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