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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
2400/40 = 6600/n // - 6600/n
2400/40-(6600/n) = 0
2400/40-6600*n^-1 = 0
-6600*n^-1 = -60 // : -6600
n^-1 = 1/110
-1 < 0
1/(n^1) = 1/110 // * n^1
1 = 1/110*n^1 // : 1/110
110 = n^1
n = 110
n = 110
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