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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
2/d = 1.2/1.5 // - 1.2/1.5
2/d-(1.2/1.5) = 0
2/d-0.8 = 0
2*d^-1 = 0.8 // : 2
d^-1 = 0.4
-1 < 0
1/(d^1) = 0.4 // * d^1
1 = 0.4*d^1 // : 0.4
2.5 = d^1
d = 2.5
d = 2.5
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