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D( x )
x < 0
x < 0
x in <0:+oo)
8*x^(5/2)-40 = 0
8*x^(5/2) = 40 // : 8
x^(5/2) = 5
x^(5/2) = 5 // ^ 2
x^5 = 25 // ^ 1/5
x = 25^(1/5)
x = 25^(1/5)
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