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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
0.72/d = 0.12 // - 0.12
0.72/d-0.12 = 0
0.72*d^-1 = 0.12 // : 0.72
d^-1 = 0.16666667
-1 < 0
1/(d^1) = 0.16666667 // * d^1
1 = 0.16666667*d^1 // : 0.16666667
5.99999988 = d^1
d = 5.99999988
d = 5.99999988
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