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D( x )
x < 0
x < 0
x in <0:+oo)
(1/2)*x^(5/2) = 16 // - 16
(1/2)*x^(5/2)-16 = 0
1/2*x^(5/2) = 16 // : 1/2
x^(5/2) = 32
x^(5/2) = 32 // ^ 2
x^5 = 1024 // ^ 1/5
x = 4
x = 4
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