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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
28/3 = 2/c // - 2/c
28/3-(2/c) = 0
28/3-2*c^-1 = 0
-2*c^-1 = -28/3 // : -2
c^-1 = 14/3
-1 < 0
1/(c^1) = 14/3 // * c^1
1 = 14/3*c^1 // : 14/3
3/14 = c^1
c = 3/14
c = 3/14
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