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D( x )
x < 0
x < 0
x in <0:+oo)
4*x^(5/2)-20 = 0
4*x^(5/2) = 20 // : 4
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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