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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
12/d = 8/5 // - 8/5
12/d-(8/5) = 0
12/d-8/5 = 0
12*d^-1 = 8/5 // : 12
d^-1 = 2/15
-1 < 0
1/(d^1) = 2/15 // * d^1
1 = 2/15*d^1 // : 2/15
15/2 = d^1
d = 15/2
d = 15/2
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