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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
10/n = 3/7 // - 3/7
10/n-(3/7) = 0
10/n-3/7 = 0
10*n^-1 = 3/7 // : 10
n^-1 = 3/70
-1 < 0
1/(n^1) = 3/70 // * n^1
1 = 3/70*n^1 // : 3/70
70/3 = n^1
n = 70/3
n = 70/3
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