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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
15/30 = 2/n // - 2/n
15/30-(2/n) = 0
15/30-2*n^-1 = 0
-2*n^-1 = -1/2 // : -2
n^-1 = 1/4
-1 < 0
1/(n^1) = 1/4 // * n^1
1 = 1/4*n^1 // : 1/4
4 = n^1
n = 4
n = 4
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