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D( x )
27*x^9 = 0
27*x^9 = 0
27*x^9 = 0
27*x^9 = 0 // : 27
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
((27*x^9)^-1)/3 = 0
1/81*x^-9 = 0 // : 1/81
x^-9 = 0
x należy do O
x belongs to the empty set
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