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D( x )
x < 0
x < 0
x in <0:+oo)
81/33 = x^5.5 // - x^5.5
81/33-x^5.5 = 0
-1*x^5.5 = -27/11 // : -1
x^5.5 = 27/11
x^5 = (27/11)^(1/0.5) // ^ 1/5
x = (729/121)^(1/5)
x = (729/121)^(1/5)
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