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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
8/d = 12/30 // - 12/30
8/d-(12/30) = 0
8/d-2/5 = 0
8*d^-1 = 2/5 // : 8
d^-1 = 1/20
-1 < 0
1/(d^1) = 1/20 // * d^1
1 = 1/20*d^1 // : 1/20
20 = d^1
d = 20
d = 20
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