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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2.2/n = 4.8/18 // - 4.8/18
2.2/n-(4.8/18) = 0
2.2/n-0.26666667 = 0
2.2*n^-1 = 0.26666667 // : 2.2
n^-1 = 0.12121212
-1 < 0
1/(n^1) = 0.12121212 // * n^1
1 = 0.12121212*n^1 // : 0.12121212
8.25000008 = n^1
n = 8.25000008
n = 8.25000008
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