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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
0 = ((-8/81)*x^-17)/9 // - ((-8/81)*x^-17)/9
0-(((-8/81)*x^-17)/9) = 0
(8/729)*x^-17 = 0
8/729*x^-17 = 0 // : 8/729
x^-17 = 0
x należy do O
x belongs to the empty set
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