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D( x )
32*x^15 = 0
32*x^15 = 0
32*x^15 = 0
32*x^15 = 0 // : 32
x^15 = 0
x = 0
x in (-oo:0) U (0:+oo)
(32*x^15)^(-1/5) = 0
1/2*x^-3 = 0 // : 1/2
x^-3 = 0
x należy do O
x belongs to the empty set
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