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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
110/x-(110/x)+5 = -1/5 // + -1/5
110/x-(110/x)-(-1/5)+5 = 0
110/x-110*x^-1+1/5+5 = 0
26/5 = 0
x belongs to the empty set
x belongs to the empty set
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