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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/n-(7/n)-6 = 0
3/n-7*n^-1-6 = 0
-4*n^-1 = 6 // : -4
n^-1 = -3/2
-1 < 0
1/(n^1) = -3/2 // * n^1
1 = -3/2*n^1 // : -3/2
-2/3 = n^1
n = -2/3
n = -2/3
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