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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
6/15 = 6/c // - 6/c
6/15-(6/c) = 0
6/15-6*c^-1 = 0
-6*c^-1 = -2/5 // : -6
c^-1 = 1/15
-1 < 0
1/(c^1) = 1/15 // * c^1
1 = 1/15*c^1 // : 1/15
15 = c^1
c = 15
c = 15
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