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D( x )
-64*x^15 = 0
-64*x^15 = 0
-64*x^15 = 0
-64*x^15 = 0 // : -64
x^15 = 0
x = 0
x in (-oo:0) U (0:+oo)
(-64*x^15)^(-4/3) = 0
1/256*x^-20 = 0 // : 1/256
x^-20 = 0
x należy do O
x belongs to the empty set
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