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D( x )
20*x^9 = 0
20*x^9 = 0
20*x^9 = 0
20*x^9 = 0 // : 20
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
(5*x^3)/(20*x^9) = 0
1/4*x^-6 = 0 // : 1/4
x^-6 = 0
x należy do O
x belongs to the empty set
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