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D( x )
x < 0
x < 0
x in <0:+oo)
2*x^(5/2)-8 = 0
2*x^(5/2) = 8 // : 2
x^(5/2) = 4
x^(5/2) = 4 // ^ 2
x^5 = 16 // ^ 1/5
x = 16^(1/5)
x = 16^(1/5)
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