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D( x )
(1/4)*x = 0
(1/4)*x = 0
(1/4)*x = 0
1/4*x = 0 // : 1/4
x = 0
x in (-oo:0) U (0:+oo)
((1/4)*x)^-2 = 0
16*x^-2 = 0 // : 16
x^-2 = 0
x należy do O
x belongs to the empty set
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