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