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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/4 = 4/n // - 4/n
6/4-(4/n) = 0
6/4-4*n^-1 = 0
-4*n^-1 = -3/2 // : -4
n^-1 = 3/8
-1 < 0
1/(n^1) = 3/8 // * n^1
1 = 3/8*n^1 // : 3/8
8/3 = n^1
n = 8/3
n = 8/3
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