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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
128/x = 27 // - 27
128/x-27 = 0
128*x^-1 = 27 // : 128
x^-1 = 27/128
-1 < 0
1/(x^1) = 27/128 // * x^1
1 = 27/128*x^1 // : 27/128
128/27 = x^1
x = 128/27
x = 128/27
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