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