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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
25.13/d = 3.14159 // - 3.14159
25.13/d-3.14159 = 0
25.13*d^-1 = 3.14159 // : 25.13
d^-1 = 0.12501353
-1 < 0
1/(d^1) = 0.12501353 // * d^1
1 = 0.12501353*d^1 // : 0.12501353
7.99913417 = d^1
d = 7.99913417
d = 7.99913417
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