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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(12*x)/x-2 = 6/1 // - 6/1
(12*x)/x-(6/1)-2 = 0
(12*x)/x-6-2 = 0
4 = 0
x belongs to the empty set
x belongs to the empty set
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