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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2.2/n = 1.3/15 // - 1.3/15
2.2/n-(1.3/15) = 0
2.2/n-0.08666667 = 0
2.2*n^-1 = 0.08666667 // : 2.2
n^-1 = 0.03939394
-1 < 0
1/(n^1) = 0.03939394 // * n^1
1 = 0.03939394*n^1 // : 0.03939394
25.38461499 = n^1
n = 25.38461499
n = 25.38461499
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