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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
222/1515 = 37/n // - 37/n
222/1515-(37/n) = 0
222/1515-37*n^-1 = 0
-37*n^-1 = -74/505 // : -37
n^-1 = 2/505
-1 < 0
1/(n^1) = 2/505 // * n^1
1 = 2/505*n^1 // : 2/505
505/2 = n^1
n = 505/2
n = 505/2
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