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