x=/=0
(x+1)/x>0
Tabel
x l-∞......................-1.....0...............................+∞
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x l - - - - - - - - - - - - - -o+ + + + + + + + +
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x+1 l_ - - - - - - - - - - -0 + + + + + +
____________________________________________________
(x+1)/x l+ + + + l - -l + + + + + + +
x∈(-∞, -1)U(0 ,∞)