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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
5/27 = 8/x // - 8/x
5/27-(8/x) = 0
5/27-8*x^-1 = 0
-8*x^-1 = -5/27 // : -8
x^-1 = 5/216
-1 < 0
1/(x^1) = 5/216 // * x^1
1 = 5/216*x^1 // : 5/216
216/5 = x^1
x = 216/5
x = 216/5
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