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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
-3 = 12/c // - 12/c
-(12/c)-3 = 0
-12*c^-1-3 = 0
-12*c^-1 = 3 // : -12
c^-1 = -1/4
-1 < 0
1/(c^1) = -1/4 // * c^1
1 = -1/4*c^1 // : -1/4
-4 = c^1
c = -4
c = -4
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