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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
0.4/d = 8 // - 8
0.4/d-8 = 0
0.4*d^-1 = 8 // : 0.4
d^-1 = 20
-1 < 0
1/(d^1) = 20 // * d^1
1 = 20*d^1 // : 20
1/20 = d^1
d = 1/20
d = 1/20
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