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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
36/54 = 18/c // - 18/c
36/54-(18/c) = 0
36/54-18*c^-1 = 0
-18*c^-1 = -2/3 // : -18
c^-1 = 1/27
-1 < 0
1/(c^1) = 1/27 // * c^1
1 = 1/27*c^1 // : 1/27
27 = c^1
c = 27
c = 27
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