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x in (-oo:+oo)
(x^3)/4 = 8/27 // - 8/27
(x^3)/4-(8/27) = 0
(x^3)/4-8/27 = 0
1/4*x^3 = 8/27 // : 1/4
x^3 = 32/27
x^3 = 32/27 // ^ 1/3
x = (32/27)^(1/3)
x = (32/27)^(1/3)
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