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D( x )
x < 0
x < 0
x in <0:+oo)
(2/5)*x^(5/4) = (2/3)*x^(3/4) // - (2/3)*x^(3/4)
(2/5)*x^(5/4)-((2/3)*x^(3/4)) = 0
(2/5)*x^(5/4)+(-2/3)*x^(3/4) = 0
2/5*x^(5/4)-2/3*x^(3/4) = 0
2*x^(3/4)*(1/5*x^(1/2)-1/3) = 0
1/5*x^(1/2) = 1/3 // : 1/5
x^(1/2) = 5/3
x^(1/2) = 5/3 // ^ 2
x = 25/9
2*x^(3/4) = 0
2*x^(3/4) = 0 // : 2
x^(3/4) = 0
x = 0
x in { 25/9, 0 }
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