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D( n )
n = 0
n = 0
n = 0
n in (-oo:0) U (0:+oo)
27/5 = 54/n // - 54/n
27/5-(54/n) = 0
27/5-54*n^-1 = 0
-54*n^-1 = -27/5 // : -54
n^-1 = 1/10
-1 < 0
1/(n^1) = 1/10 // * n^1
1 = 1/10*n^1 // : 1/10
10 = n^1
n = 10
n = 10
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