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D( x )
x = 0
x = 0
x = 0
x in (-oo:0) U (0:+oo)
(3*x^-3)/2-8 = -1943/243 // + -1943/243
(3*x^-3)/2-(-1943/243)-8 = 0
(3*x^-3)/2+1943/243-8 = 0
3/2*x^-3 = 1/243 // : 3/2
x^-3 = 2/729
-3 < 0
1/(x^3) = 2/729 // * x^3
1 = 2/729*x^3 // : 2/729
729/2 = x^3
x^3 = 729/2 // ^ 1/3
x = (729/2)^(1/3)
x = (729/2)^(1/3)
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