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D( c )
c^-9 = 0
c = 0
c^-9 = 0
c^-9 = 0
1*c^-9 = 0 // : 1
c^-9 = 0
c naleu017Cy do O
c = 0
c = 0
c in (-oo:0) U (0:+oo)
(c^4)/(c^-9) = 0
1*c^13 = 0 // : 1
c^13 = 0
c = 0
c in { 0}
c belongs to the empty set
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