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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/n-7 = 8/2 // - 8/2
5/n-(8/2)-7 = 0
5/n-7-4 = 0
5*n^-1 = 11 // : 5
n^-1 = 11/5
-1 < 0
1/(n^1) = 11/5 // * n^1
1 = 11/5*n^1 // : 11/5
5/11 = n^1
n = 5/11
n = 5/11
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