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D( c )
c = 0
c = 0
c = 0
c in (-oo:0) U (0:+oo)
4 = 8/c-5 // - 8/c-5
4-(8/c)+5 = 0
4-8*c^-1+5 = 0
-8*c^-1 = -9 // : -8
c^-1 = 9/8
-1 < 0
1/(c^1) = 9/8 // * c^1
1 = 9/8*c^1 // : 9/8
8/9 = c^1
c = 8/9
c = 8/9
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