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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
112/n = 7/11 // - 7/11
112/n-(7/11) = 0
112/n-7/11 = 0
112*n^-1 = 7/11 // : 112
n^-1 = 1/176
-1 < 0
1/(n^1) = 1/176 // * n^1
1 = 1/176*n^1 // : 1/176
176 = n^1
n = 176
n = 176
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