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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
((c*z^8)/x)^5 = 0
c^5*x^-5*z^40 = 0 // : c^5*z^40
x^-5 = 0
x naleu017Cy do O
x belongs to the empty set
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