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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
n-(2/n)-5 = n+3/n-9 // - n+3/n-9
n-n-(2/n)-(3/n)-5+9 = 0
n-n-2*n^-1-3*n^-1-5+9 = 0
-5*n^-1 = -4 // : -5
n^-1 = 4/5
-1 < 0
1/(n^1) = 4/5 // * n^1
1 = 4/5*n^1 // : 4/5
5/4 = n^1
n = 5/4
n = 5/4
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