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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
x^(-3/5) = 27 // - 27
x^(-3/5)-27 = 0
1*x^(-3/5) = 27 // : 1
x^(-3/5) = 27
-3/5 < 0
1/(x^(3/5)) = 27 // * x^(3/5)
1 = 27*x^(3/5) // : 27
1/27 = x^(3/5)
x^(3/5) = 1/27 // ^ 5
x^3 = 1/14348907 // ^ 1/3
x = 1/243
x = 1/243
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