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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
5/d = 9/10 // - 9/10
5/d-(9/10) = 0
5/d-9/10 = 0
5*d^-1 = 9/10 // : 5
d^-1 = 9/50
-1 < 0
1/(d^1) = 9/50 // * d^1
1 = 9/50*d^1 // : 9/50
50/9 = d^1
d = 50/9
d = 50/9
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