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D( x )
-8*x^9 = 0
-8*x^9 = 0
-8*x^9 = 0
-8*x^9 = 0 // : -8
x^9 = 0
x = 0
x in (-oo:0) U (0:+oo)
(-16*x^8)/(-8*x^9) = 0
2*x^-1 = 0 // : 2
x^-1 = 0
x należy do O
x belongs to the empty set
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