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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
9/13 = 27/c // - 27/c
9/13-(27/c) = 0
9/13-27*c^-1 = 0
-27*c^-1 = -9/13 // : -27
c^-1 = 1/39
-1 < 0
1/(c^1) = 1/39 // * c^1
1 = 1/39*c^1 // : 1/39
39 = c^1
c = 39
c = 39
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