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