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D( x )
x < 0
x < 0
x in <0:+oo)
x^(5/2) = 0.12 // - 0.12
x^(5/2)-0.12 = 0
1*x^(5/2) = 0.12 // : 1
x^(5/2) = 0.12
x^(5/2) = 0.12 // ^ 2
x^5 = 0.12^2 // ^ 1/5
x = 0.12^(2/5)
x = 0.12^(2/5)
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