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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
6/5 = 1500/n // - 1500/n
6/5-(1500/n) = 0
6/5-1500*n^-1 = 0
-1500*n^-1 = -6/5 // : -1500
n^-1 = 1/1250
-1 < 0
1/(n^1) = 1/1250 // * n^1
1 = 1/1250*n^1 // : 1/1250
1250 = n^1
n = 1250
n = 1250
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