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D( x )
(x^3)^7 = 0
(x^3)^7 = 0
(x^3)^7 = 0
1*x^21 = 0 // : 1
x^21 = 0
x = 0
x in (-oo:0) U (0:+oo)
((((x^1)/3)^2)/((x^3)^7))/3 = 0
(((x/3)^2)/((x^3)^7))/3 = 0
1/27*x^-19 = 0 // : 1/27
x^-19 = 0
x należy do O
x belongs to the empty set
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