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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3.5/4 = 8.4/n // - 8.4/n
3.5/4-(8.4/n) = 0
3.5/4-8.4*n^-1 = 0
-8.4*n^-1 = -0.875 // : -8.4
n^-1 = 0.10416667
-1 < 0
1/(n^1) = 0.10416667 // * n^1
1 = 0.10416667*n^1 // : 0.10416667
9.59999969 = n^1
n = 9.59999969
n = 9.59999969
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