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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2/n = 3.5 // - 3.5
2/n-3.5 = 0
2*n^-1 = 3.5 // : 2
n^-1 = 1.75
-1 < 0
1/(n^1) = 1.75 // * n^1
1 = 1.75*n^1 // : 1.75
0.57142857 = n^1
n = 0.57142857
n = 0.57142857
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