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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
5/6 = 9/c // - 9/c
5/6-(9/c) = 0
5/6-9*c^-1 = 0
-9*c^-1 = -5/6 // : -9
c^-1 = 5/54
-1 < 0
1/(c^1) = 5/54 // * c^1
1 = 5/54*c^1 // : 5/54
54/5 = c^1
c = 54/5
c = 54/5
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