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D( x )
(5/2)*x = 0
(5/2)*x = 0
(5/2)*x = 0
5/2*x = 0 // : 5/2
x = 0
x in (-oo:0) U (0:+oo)
6/((5/2)*x) = 0
12/5*x^-1 = 0 // : 12/5
x^-1 = 0
x należy do O
x belongs to the empty set
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