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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
56/n = 15/14 // - 15/14
56/n-(15/14) = 0
56/n-15/14 = 0
56*n^-1 = 15/14 // : 56
n^-1 = 15/784
-1 < 0
1/(n^1) = 15/784 // * n^1
1 = 15/784*n^1 // : 15/784
784/15 = n^1
n = 784/15
n = 784/15
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