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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
210/150 = 322/n // - 322/n
210/150-(322/n) = 0
210/150-322*n^-1 = 0
-322*n^-1 = -7/5 // : -322
n^-1 = 1/230
-1 < 0
1/(n^1) = 1/230 // * n^1
1 = 1/230*n^1 // : 1/230
230 = n^1
n = 230
n = 230
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