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D( x )
x < 0
x < 0
x in <0:+oo)
x^(3/2) = 805.432 // - 805.432
x^(3/2)-805.432 = 0
1*x^(3/2) = 805.432 // : 1
x^(3/2) = 805.432
x^(3/2) = 805.432 // ^ 2
x^3 = 805.432^2 // ^ 1/3
x = 805.432^(2/3)
x = 805.432^(2/3)
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