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D( x )
1*x = 0
1*x = 0
1*x = 0
x = 0
x in (-oo:0) U (0:+oo)
8 = (2*x)/(1*x) // - (2*x)/(1*x)
8-((2*x)/(1*x)) = 0
8-2 = 0
6 = 0
x belongs to the empty set
x belongs to the empty set
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