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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
5/9 = 43/n // - 43/n
5/9-(43/n) = 0
5/9-43*n^-1 = 0
-43*n^-1 = -5/9 // : -43
n^-1 = 5/387
-1 < 0
1/(n^1) = 5/387 // * n^1
1 = 5/387*n^1 // : 5/387
387/5 = n^1
n = 387/5
n = 387/5
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