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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
3.2/d = 16/7 // - 16/7
3.2/d-(16/7) = 0
3.2/d-16/7 = 0
3.2*d^-1 = 16/7 // : 3.2
d^-1 = 0.71428572
-1 < 0
1/(d^1) = 0.71428572 // * d^1
1 = 0.71428572*d^1 // : 0.71428572
1.39999999 = d^1
d = 1.39999999
d = 1.39999999
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