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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
10/3 = 3/n-7 // - 3/n-7
10/3-(3/n)+7 = 0
10/3-3*n^-1+7 = 0
-3*n^-1 = -31/3 // : -3
n^-1 = 31/9
-1 < 0
1/(n^1) = 31/9 // * n^1
1 = 31/9*n^1 // : 31/9
9/31 = n^1
n = 9/31
n = 9/31
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