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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
14.2/6 = 20/n // - 20/n
14.2/6-(20/n) = 0
14.2/6-20*n^-1 = 0
-20*n^-1 = -2.36666667 // : -20
n^-1 = 0.11833333
-1 < 0
1/(n^1) = 0.11833333 // * n^1
1 = 0.11833333*n^1 // : 0.11833333
8.45070446 = n^1
n = 8.45070446
n = 8.45070446
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