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D( x )
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0
3*x-1 = 0 // + 1
3*x = 1 // : 3
x = 1/3
x in (-oo:1/3) U (1/3:+oo)
(27*x^3-4)/(3*x-1) = 0
27*x^3 = 4 // : 27
x^3 = 4/27
x^3 = 4/27 // ^ 1/3
x = (4/27)^(1/3)
x = (4/27)^(1/3)
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