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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
256/4 = 224/n // - 224/n
256/4-(224/n) = 0
256/4-224*n^-1 = 0
-224*n^-1 = -64 // : -224
n^-1 = 2/7
-1 < 0
1/(n^1) = 2/7 // * n^1
1 = 2/7*n^1 // : 2/7
7/2 = n^1
n = 7/2
n = 7/2
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