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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
10/3 = 4/n // - 4/n
10/3-(4/n) = 0
10/3-4*n^-1 = 0
-4*n^-1 = -10/3 // : -4
n^-1 = 5/6
-1 < 0
1/(n^1) = 5/6 // * n^1
1 = 5/6*n^1 // : 5/6
6/5 = n^1
n = 6/5
n = 6/5
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