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