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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
240/n = 40 // - 40
240/n-40 = 0
240*n^-1 = 40 // : 240
n^-1 = 1/6
-1 < 0
1/(n^1) = 1/6 // * n^1
1 = 1/6*n^1 // : 1/6
6 = n^1
n = 6
n = 6
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