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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
((3/10)/2)/5 = 1/d // - 1/d
((3/10)/2)/5-(1/d) = 0
((3/10)/2)/5-d^-1 = 0
-1*d^-1 = -3/100 // : -1
d^-1 = 3/100
-1 < 0
1/(d^1) = 3/100 // * d^1
1 = 3/100*d^1 // : 3/100
100/3 = d^1
d = 100/3
d = 100/3
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