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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-1.8/21.6 = -3/n // + -3/n
-(-3/n)-1.8/21.6 = 0
3*n^-1-1.8/21.6 = 0
3*n^-1 = 0.08333333 // : 3
n^-1 = 0.02777778
-1 < 0
1/(n^1) = 0.02777778 // * n^1
1 = 0.02777778*n^1 // : 0.02777778
35.99999712 = n^1
n = 35.99999712
n = 35.99999712
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