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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
-6.3/22.4 = -9/n // + -9/n
-(-9/n)-6.3/22.4 = 0
9*n^-1-6.3/22.4 = 0
9*n^-1 = 0.28125 // : 9
n^-1 = 0.03125
-1 < 0
1/(n^1) = 0.03125 // * n^1
1 = 0.03125*n^1 // : 0.03125
32 = n^1
n = 32
n = 32
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