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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
33/c = 3 // - 3
33/c-3 = 0
33*c^-1 = 3 // : 33
c^-1 = 1/11
-1 < 0
1/(c^1) = 1/11 // * c^1
1 = 1/11*c^1 // : 1/11
11 = c^1
c = 11
c = 11
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