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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
5/c = 11 // - 11
5/c-11 = 0
5*c^-1 = 11 // : 5
c^-1 = 11/5
-1 < 0
1/(c^1) = 11/5 // * c^1
1 = 11/5*c^1 // : 11/5
5/11 = c^1
c = 5/11
c = 5/11
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