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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1/x-(1/x)-5 = 9/100 // - 9/100
1/x-(1/x)-(9/100)-5 = 0
1/x-x^-1-9/100-5 = 0
-509/100 = 0
x belongs to the empty set
x belongs to the empty set
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