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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
2/d = 4/5 // - 4/5
2/d-(4/5) = 0
2/d-4/5 = 0
2*d^-1 = 4/5 // : 2
d^-1 = 2/5
-1 < 0
1/(d^1) = 2/5 // * d^1
1 = 2/5*d^1 // : 2/5
5/2 = d^1
d = 5/2
d = 5/2
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