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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
56/n = 7/12 // - 7/12
56/n-(7/12) = 0
56/n-7/12 = 0
56*n^-1 = 7/12 // : 56
n^-1 = 1/96
-1 < 0
1/(n^1) = 1/96 // * n^1
1 = 1/96*n^1 // : 1/96
96 = n^1
n = 96
n = 96
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