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