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D( u )
u^5 = 0
u^5 = 0
u^5 = 0
1*u^5 = 0 // : 1
u^5 = 0
u = 0
u in (-oo:0) U (0:+oo)
85/(u^5) = 0
85*u^-5 = 0 // : 85
u^-5 = 0
u naleu017Cy do O
u belongs to the empty set
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