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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
8/2 = x/x-3 // - x/x-3
8/2-(x/x)+3 = 0
8/2-1+3 = 0
6 = 0
x belongs to the empty set
x belongs to the empty set
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