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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
6-289/c = 17 // - 17
6-289/c-17 = 0
-289*c^-1 = 11 // : -289
c^-1 = -11/289
-1 < 0
1/(c^1) = -11/289 // * c^1
1 = -11/289*c^1 // : -11/289
-289/11 = c^1
c = -289/11
c = -289/11
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