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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
4/18 = 15/c // - 15/c
4/18-(15/c) = 0
4/18-15*c^-1 = 0
-15*c^-1 = -2/9 // : -15
c^-1 = 2/135
-1 < 0
1/(c^1) = 2/135 // * c^1
1 = 2/135*c^1 // : 2/135
135/2 = c^1
c = 135/2
c = 135/2
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