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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
10/n = (4/7)/12 // - (4/7)/12
10/n-((4/7)/12) = 0
10/n-1/21 = 0
10*n^-1 = 1/21 // : 10
n^-1 = 1/210
-1 < 0
1/(n^1) = 1/210 // * n^1
1 = 1/210*n^1 // : 1/210
210 = n^1
n = 210
n = 210
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