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D( x )
32*x^5 = 0
32*x^5 = 0
32*x^5 = 0
32*x^5 = 0 // : 32
x^5 = 0
x = 0
x in (-oo:0) U (0:+oo)
(32*x^5)^(-2/5) = 0
1/4*x^-2 = 0 // : 1/4
x^-2 = 0
x należy do O
x belongs to the empty set
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