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D( x )
x/y = 0
x/y = 0
x/y = 0
x*y^-1 = 0 // : y^-1
x = 0
x in (-oo:0) U (0:+oo)
((x^2)/y)/(x/y) = 0
x = 0
x in { 0}
x belongs to the empty set
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