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D( x )
0.25*x = 0
0.25*x = 0
0.25*x = 0
0.25*x = 0 // : 0.25
x = 0
x in (-oo:0) U (0:+oo)
(0.75*200)/(0.25*x) = 0
600*x^-1 = 0 // : 600
x^-1 = 0
x należy do O
x belongs to the empty set
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