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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2/c = 5/7 // - 5/7
2/c-(5/7) = 0
2/c-5/7 = 0
2*c^-1 = 5/7 // : 2
c^-1 = 5/14
-1 < 0
1/(c^1) = 5/14 // * c^1
1 = 5/14*c^1 // : 5/14
14/5 = c^1
c = 14/5
c = 14/5
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