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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2.5/5 = 10/n // - 10/n
2.5/5-(10/n) = 0
2.5/5-10*n^-1 = 0
-10*n^-1 = -0.5 // : -10
n^-1 = 0.05
-1 < 0
1/(n^1) = 0.05 // * n^1
1 = 0.05*n^1 // : 0.05
20 = n^1
n = 20
n = 20
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