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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
2/d = 8/11.2 // - 8/11.2
2/d-(8/11.2) = 0
2/d-0.71428571 = 0
2*d^-1 = 0.71428571 // : 2
d^-1 = 0.35714286
-1 < 0
1/(d^1) = 0.35714286 // * d^1
1 = 0.35714286*d^1 // : 0.35714286
2.79999998 = d^1
d = 2.79999998
d = 2.79999998
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