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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0.3 = 1-((2*x)/x) // - 1-((2*x)/x)
(2*x)/x-1+0.3 = 0
1.3 = 0
x belongs to the empty set
x belongs to the empty set
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