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D( x )
x < 0
x < 0
x in <0:+oo)
x^(5/4)-(6*x^(5/8))+9 = 0
x^(5/4)-6*x^(5/8)+9 = 0
t_1 = x^(5/8)
1*t_1^2-6*t_1^1+9 = 0
t_1^2-6*t_1+9 = 0
DELTA = (-6)^2-(1*4*9)
DELTA = 0
t_1 = 6/(1*2)
t_1 = 3 or t_1 = 3
t_1 = 3
x^(5/8)-3 = 0
1*x^(5/8) = 3 // : 1
x^(5/8) = 3
x^(5/8) = 3 // ^ 8
x^5 = 6561 // ^ 1/5
x = 3*27^(1/5)
t_1 = 3
x^(5/8)-3 = 0
1*x^(5/8) = 3 // : 1
x^(5/8) = 3
x^(5/8) = 3 // ^ 8
x^5 = 6561 // ^ 1/5
x = 3*27^(1/5)
x in { 3*27^(1/5), 3*27^(1/5) }
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