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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
2*x^(-1/4) = 9-(4*x^(-1/4)) // - 9-(4*x^(-1/4))
2*x^(-1/4)+4*x^(-1/4)-9 = 0
6*x^(-1/4) = 9 // : 6
x^(-1/4) = 3/2
-1/4 < 0
1/(x^(1/4)) = 3/2 // * x^(1/4)
1 = 3/2*x^(1/4) // : 3/2
2/3 = x^(1/4)
x^(1/4) = 2/3 // ^ 4
x = 16/81
x = 16/81
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