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D( x )
x < 0
x < 0
x in <0:+oo)
27 = x^(3/2) // - x^(3/2)
27-x^(3/2) = 0
-1*x^(3/2) = -27 // : -1
x^(3/2) = 27
x^(3/2) = 27 // ^ 2
x^3 = 729 // ^ 1/3
x = 9
x = 9
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