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D( x )
3*x = 0
x = 0
3*x = 0
3*x = 0
3*x = 0 // : 3
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^-3*(((3*x)^-2)/3) = 0
1/27*x^-5 = 0 // : 1/27
x^-5 = 0
x naleu017Cy do O
x belongs to the empty set
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