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D( x )
(x-1)^1 = 0
(x-1)^1 = 0
(x-1)^1 = 0
x-1 = 0
x-1 = 0 // + 1
x = 1
x in (-oo:1) U (1:+oo)
(1/((x-1)^1))/3 = 0
(1/(x-1))/3 = 0
1/(3*(x-1)) = 0
1 = 0
x belongs to the empty set
x belongs to the empty set
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