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D( x )
x < 0
x < 0
x in <0:+oo)
20 = x^(3/2) // - x^(3/2)
20-x^(3/2) = 0
-1*x^(3/2) = -20 // : -1
x^(3/2) = 20
x^(3/2) = 20 // ^ 2
x^3 = 400 // ^ 1/3
x = 2*50^(1/3)
x = 2*50^(1/3)
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