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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
8/n = 0.5/0.9 // - 0.5/0.9
8/n-(0.5/0.9) = 0
8/n-0.55555556 = 0
8*n^-1 = 0.55555556 // : 8
n^-1 = 0.06944445
-1 < 0
1/(n^1) = 0.06944445 // * n^1
1 = 0.06944445*n^1 // : 0.06944445
14.39999885 = n^1
n = 14.39999885
n = 14.39999885
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