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D( c )
c^5 = 0
c^5 = 0
c^5 = 0
1*c^5 = 0 // : 1
c^5 = 0
c = 0
c in (-oo:0) U (0:+oo)
(c^17)/(c^5) = 0
1*c^12 = 0 // : 1
c^12 = 0
c = 0
c in { 0}
c belongs to the empty set
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