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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n = 2/15.4 // - 2/15.4
2/n-(2/15.4) = 0
2/n-0.12987013 = 0
2*n^-1 = 0.12987013 // : 2
n^-1 = 0.06493507
-1 < 0
1/(n^1) = 0.06493507 // * n^1
1 = 0.06493507*n^1 // : 0.06493507
15.3999988 = n^1
n = 15.3999988
n = 15.3999988
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