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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
10/75 = 18/n // - 18/n
10/75-(18/n) = 0
10/75-18*n^-1 = 0
-18*n^-1 = -2/15 // : -18
n^-1 = 1/135
-1 < 0
1/(n^1) = 1/135 // * n^1
1 = 1/135*n^1 // : 1/135
135 = n^1
n = 135
n = 135
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