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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(X^-1)/x-x^-1 = 0
X^-1*x^-1-x^-1 = 0
t_1 = x^-1
X^-1*t_1^1-1*t_1^1 = 0
-1*t_1 = 0 // : -1
t_1 = 0
t_1 = 0
x^-1+0 = 0
x^-1 = 0
1*x^-1 = 0 // : 1
x^-1 = 0
x naleu017Cy do O
x belongs to the empty set
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