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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
2/x = 27 // - 27
2/x-27 = 0
2*x^-1 = 27 // : 2
x^-1 = 27/2
-1 < 0
1/(x^1) = 27/2 // * x^1
1 = 27/2*x^1 // : 27/2
2/27 = x^1
x = 2/27
x = 2/27
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