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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x/x+4 = 3/2 // - 3/2
x/x-(3/2)+4 = 0
x/x-3/2+4 = 0
7/2 = 0
x belongs to the empty set
x belongs to the empty set
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