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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
10/n = (2/7)/18 // - (2/7)/18
10/n-((2/7)/18) = 0
10/n-1/63 = 0
10*n^-1 = 1/63 // : 10
n^-1 = 1/630
-1 < 0
1/(n^1) = 1/630 // * n^1
1 = 1/630*n^1 // : 1/630
630 = n^1
n = 630
n = 630
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