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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
16/14 = 72/n // - 72/n
16/14-(72/n) = 0
16/14-72*n^-1 = 0
-72*n^-1 = -8/7 // : -72
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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