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D( x )
(x^6)/5 = 0
(x^6)/5 = 0
(x^6)/5 = 0
1/5*x^6 = 0 // : 1/5
x^6 = 0
x = 0
x in (-oo:0) U (0:+oo)
((x^4)/3)/((x^6)/5) = 0
5/3*x^-2 = 0 // : 5/3
x^-2 = 0
x należy do O
x belongs to the empty set
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