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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/9 = 14/n // - 14/n
2/9-(14/n) = 0
2/9-14*n^-1 = 0
-14*n^-1 = -2/9 // : -14
n^-1 = 1/63
-1 < 0
1/(n^1) = 1/63 // * n^1
1 = 1/63*n^1 // : 1/63
63 = n^1
n = 63
n = 63
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