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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x-1 = 4/3 // - 4/3
x/x-(4/3)-1 = 0
x/x-4/3-1 = 0
-4/3 = 0
x belongs to the empty set
x belongs to the empty set
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