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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
12/c = 26/39 // - 26/39
12/c-(26/39) = 0
12/c-2/3 = 0
12*c^-1 = 2/3 // : 12
c^-1 = 1/18
-1 < 0
1/(c^1) = 1/18 // * c^1
1 = 1/18*c^1 // : 1/18
18 = c^1
c = 18
c = 18
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