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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x-(5/x)+6 = x-(5/x)+2 // - x-(5/x)+2
x-x-(5/x)+5/x-2+6 = 0
x-x-5*x^-1+5/x-2+6 = 0
4 = 0
x belongs to the empty set
x belongs to the empty set
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