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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
1.55 = x/x-1 // - x/x-1
1-(x/x)+1.55 = 0
1-1+1.55 = 0
1.55 = 0
x belongs to the empty set
x belongs to the empty set
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