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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n = 2.1/2 // - 2.1/2
4/n-(2.1/2) = 0
4/n-1.05 = 0
4*n^-1 = 1.05 // : 4
n^-1 = 0.2625
-1 < 0
1/(n^1) = 0.2625 // * n^1
1 = 0.2625*n^1 // : 0.2625
3.80952381 = n^1
n = 3.80952381
n = 3.80952381
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