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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4.5/n = 3.5 // - 3.5
4.5/n-3.5 = 0
4.5*n^-1 = 3.5 // : 4.5
n^-1 = 0.77777778
-1 < 0
1/(n^1) = 0.77777778 // * n^1
1 = 0.77777778*n^1 // : 0.77777778
1.28571428 = n^1
n = 1.28571428
n = 1.28571428
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