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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
7/3 = 3/n // - 3/n
7/3-(3/n) = 0
7/3-3*n^-1 = 0
-3*n^-1 = -7/3 // : -3
n^-1 = 7/9
-1 < 0
1/(n^1) = 7/9 // * n^1
1 = 7/9*n^1 // : 7/9
9/7 = n^1
n = 9/7
n = 9/7
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