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D( d )
d = 0
d = 0
d = 0
d in (-oo:0) U (0:+oo)
30/25 = 2.4/d // - 2.4/d
30/25-(2.4/d) = 0
30/25-2.4*d^-1 = 0
-2.4*d^-1 = -6/5 // : -2.4
d^-1 = 0.5
-1 < 0
1/(d^1) = 0.5 // * d^1
1 = 0.5*d^1 // : 0.5
2 = d^1
d = 2
d = 2
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