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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
13/c = 1/2 // - 1/2
13/c-(1/2) = 0
13/c-1/2 = 0
13*c^-1 = 1/2 // : 13
c^-1 = 1/26
-1 < 0
1/(c^1) = 1/26 // * c^1
1 = 1/26*c^1 // : 1/26
26 = c^1
c = 26
c = 26
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