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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
20/125 = 24/n // - 24/n
20/125-(24/n) = 0
20/125-24*n^-1 = 0
-24*n^-1 = -4/25 // : -24
n^-1 = 1/150
-1 < 0
1/(n^1) = 1/150 // * n^1
1 = 1/150*n^1 // : 1/150
150 = n^1
n = 150
n = 150
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