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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
3 = x/x-6000 // - x/x-6000
3-(x/x)+6000 = 0
3-1+6000 = 0
6002 = 0
x belongs to the empty set
x belongs to the empty set
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