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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
4.5/d = 31.4 // - 31.4
4.5/d-31.4 = 0
4.5*d^-1 = 31.4 // : 4.5
d^-1 = 6.97777778
-1 < 0
1/(d^1) = 6.97777778 // * d^1
1 = 6.97777778*d^1 // : 6.97777778
0.1433121 = d^1
d = 0.1433121
d = 0.1433121
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