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D( x )
x < 0
x < 0
x in <0:+oo)
6*x^(5/2)-12 = 0
6*x^(5/2) = 12 // : 6
x^(5/2) = 2
x^(5/2) = 2 // ^ 2
x^5 = 4 // ^ 1/5
x = 4^(1/5)
x = 4^(1/5)
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