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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x+1/x = x/1 // - x/1
x-(x/1)+1/x = 0
x-x+1/x = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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