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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)
(5*x-5)/(x-1) = 0
5*x-5 = 0 // + 5
5*x = 5 // : 5
x = 5/5
x = 1
x in { 1}
x belongs to the empty set
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