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D( x )
x < 0
x < 0
x in <0:+oo)
3*x^(9/2)-15 = 0
3*x^(9/2) = 15 // : 3
x^(9/2) = 5
x^(9/2) = 5 // ^ 2
x^9 = 25 // ^ 1/9
x = 25^(1/9)
x = 25^(1/9)
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