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D( p )
11*p^4 = 0
11*p^4 = 0
11*p^4 = 0
11*p^4 = 0 // : 11
p^4 = 0
p = 0
p in (-oo:0) U (0:+oo)
(5*p^3)/(11*p^4) = 0
5/11*p^-1 = 0 // : 5/11
p^-1 = 0
p naleu017Cy do O
p belongs to the empty set
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