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D( x )
x < 0
x = 0
x < 0
x = 0
x = 0
x in (0:+oo)
3*x^(-3/2) = 12 // - 12
3*x^(-3/2)-12 = 0
3*x^(-3/2) = 12 // : 3
x^(-3/2) = 4
-3/2 < 0
1/(x^(3/2)) = 4 // * x^(3/2)
1 = 4*x^(3/2) // : 4
1/4 = x^(3/2)
x^(3/2) = 1/4 // ^ 2
x^3 = 1/16 // ^ 1/3
x = (1/16)^(1/3)
x = (1/16)^(1/3)
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