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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
3/8 = 225/n // - 225/n
3/8-(225/n) = 0
3/8-225*n^-1 = 0
-225*n^-1 = -3/8 // : -225
n^-1 = 1/600
-1 < 0
1/(n^1) = 1/600 // * n^1
1 = 1/600*n^1 // : 1/600
600 = n^1
n = 600
n = 600
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