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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(1/x-(1/x)-12)/12 = 0
(1/x-x^-1-12)/12 = 0
-12/12 = 0
-12 = 0
x belongs to the empty set
x belongs to the empty set
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