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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x^-3)/2 = 12 // - 12
(3*x^-3)/2-12 = 0
3/2*x^-3 = 12 // : 3/2
x^-3 = 8
-3 < 0
1/(x^3) = 8 // * x^3
1 = 8*x^3 // : 8
1/8 = x^3
x^3 = 1/8 // ^ 1/3
x = 1/2
x = 1/2
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