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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
10/7 = 2/n // - 2/n
10/7-(2/n) = 0
10/7-2*n^-1 = 0
-2*n^-1 = -10/7 // : -2
n^-1 = 5/7
-1 < 0
1/(n^1) = 5/7 // * n^1
1 = 5/7*n^1 // : 5/7
7/5 = n^1
n = 7/5
n = 7/5
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