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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
-5/c = 1/3 // - 1/3
-5/c-(1/3) = 0
-5/c-1/3 = 0
-5*c^-1 = 1/3 // : -5
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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