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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
1.12/3 = 12/d // - 12/d
1.12/3-(12/d) = 0
1.12/3-12*d^-1 = 0
-12*d^-1 = -0.37333333 // : -12
d^-1 = 0.03111111
-1 < 0
1/(d^1) = 0.03111111 // * d^1
1 = 0.03111111*d^1 // : 0.03111111
32.14285829 = d^1
d = 32.14285829
d = 32.14285829
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