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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
6/c = -4 // + 4
6/c+4 = 0
6*c^-1 = -4 // : 6
c^-1 = -2/3
-1 < 0
1/(c^1) = -2/3 // * c^1
1 = -2/3*c^1 // : -2/3
-3/2 = c^1
c = -3/2
c = -3/2
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