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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
6/16 = 4/c // - 4/c
6/16-(4/c) = 0
6/16-4*c^-1 = 0
-4*c^-1 = -3/8 // : -4
c^-1 = 3/32
-1 < 0
1/(c^1) = 3/32 // * c^1
1 = 3/32*c^1 // : 3/32
32/3 = c^1
c = 32/3
c = 32/3
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