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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2/c = 23/7 // - 23/7
2/c-(23/7) = 0
2/c-23/7 = 0
2*c^-1 = 23/7 // : 2
c^-1 = 23/14
-1 < 0
1/(c^1) = 23/14 // * c^1
1 = 23/14*c^1 // : 23/14
14/23 = c^1
c = 14/23
c = 14/23
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