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D( D )
D = 0
D = 0
D = 0
D in (-oo:0) U (0:+oo)
5/D = 6/19 // - 6/19
5/D-(6/19) = 0
5/D-6/19 = 0
5*D^-1 = 6/19 // : 5
D^-1 = 6/95
-1 < 0
1/(D^1) = 6/95 // * D^1
1 = 6/95*D^1 // : 6/95
95/6 = D^1
D = 95/6
D = 95/6
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