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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(x_2*x_3)/x = 0
x^-1*x_2*x_3 = 0 // : x_2*x_3
x^-1 = 0
x należy do O
x belongs to the empty set
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