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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-1.8/12.6 = -6/n // + -6/n
-(-6/n)-1.8/12.6 = 0
6*n^-1-1.8/12.6 = 0
6*n^-1 = 0.14285714 // : 6
n^-1 = 0.02380952
-1 < 0
1/(n^1) = 0.02380952 // * n^1
1 = 0.02380952*n^1 // : 0.02380952
42.00000672 = n^1
n = 42.00000672
n = 42.00000672
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