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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
4/n = 3.2/8.4 // - 3.2/8.4
4/n-(3.2/8.4) = 0
4/n-0.38095238 = 0
4*n^-1 = 0.38095238 // : 4
n^-1 = 0.0952381
-1 < 0
1/(n^1) = 0.0952381 // * n^1
1 = 0.0952381*n^1 // : 0.0952381
10.49999948 = n^1
n = 10.49999948
n = 10.49999948
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