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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
-12/5 = 15/c // - 15/c
-(15/c)-12/5 = 0
-15*c^-1-12/5 = 0
-15*c^-1 = 12/5 // : -15
c^-1 = -4/25
-1 < 0
1/(c^1) = -4/25 // * c^1
1 = -4/25*c^1 // : -4/25
-25/4 = c^1
c = -25/4
c = -25/4
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