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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
5/c = 9 // - 9
5/c-9 = 0
5*c^-1 = 9 // : 5
c^-1 = 9/5
-1 < 0
1/(c^1) = 9/5 // * c^1
1 = 9/5*c^1 // : 9/5
5/9 = c^1
c = 5/9
c = 5/9
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