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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
24/n = 30/100 // - 30/100
24/n-(30/100) = 0
24/n-3/10 = 0
24*n^-1 = 3/10 // : 24
n^-1 = 1/80
-1 < 0
1/(n^1) = 1/80 // * n^1
1 = 1/80*n^1 // : 1/80
80 = n^1
n = 80
n = 80
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