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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
2/c-2 = 2-(4/c) // - 2-(4/c)
2/c+4/c-2-2 = 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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