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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
8/10 = 12.4/d // - 12.4/d
8/10-(12.4/d) = 0
8/10-12.4*d^-1 = 0
-12.4*d^-1 = -4/5 // : -12.4
d^-1 = 0.06451613
-1 < 0
1/(d^1) = 0.06451613 // * d^1
1 = 0.06451613*d^1 // : 0.06451613
15.49999977 = d^1
d = 15.49999977
d = 15.49999977
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