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D( x )
x = 0
14*x^-8 = 0
x = 0
x = 0
14*x^-8 = 0
14*x^-8 = 0
14*x^-8 = 0 // : 14
x^-8 = 0
x naleu017Cy do O
x in (-oo:0) U (0:+oo)
(28*x^9)/(14*x^-8) = 0
2*x^17 = 0 // : 2
x^17 = 0
x = 0
x in { 0}
x belongs to the empty set
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