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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
1.9/n = 4.3/15 // - 4.3/15
1.9/n-(4.3/15) = 0
1.9/n-0.28666667 = 0
1.9*n^-1 = 0.28666667 // : 1.9
n^-1 = 0.15087719
-1 < 0
1/(n^1) = 0.15087719 // * n^1
1 = 0.15087719*n^1 // : 0.15087719
6.62790711 = n^1
n = 6.62790711
n = 6.62790711
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