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D( x )
x-1 = 0
x-1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(e^x)/(x-1) = 0
(e^x)/(x-1) = 0 // * x-1
e^x = 0
x należy do O
x belongs to the empty set
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