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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/7 = 10/n // - 10/n
2/7-(10/n) = 0
2/7-10*n^-1 = 0
-10*n^-1 = -2/7 // : -10
n^-1 = 1/35
-1 < 0
1/(n^1) = 1/35 // * n^1
1 = 1/35*n^1 // : 1/35
35 = n^1
n = 35
n = 35
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