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D( x )
x < 0
x < 0
x in <0:+oo)
x^(3/2)-8 = 0
1*x^(3/2) = 8 // : 1
x^(3/2) = 8
x^(3/2) = 8 // ^ 2
x^3 = 64 // ^ 1/3
x = 4
x = 4
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