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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
8/d = -12/20 // + -12/20
8/d-(-12/20) = 0
8/d+3/5 = 0
8*d^-1 = -3/5 // : 8
d^-1 = -3/40
-1 < 0
1/(d^1) = -3/40 // * d^1
1 = -3/40*d^1 // : -3/40
-40/3 = d^1
d = -40/3
d = -40/3
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