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(2*x^3)/4-(1/4) = 0
(2*x^3)/4-1/4 = 0
1/2*x^3 = 1/4 // : 1/2
x^3 = 1/2
x^3 = 1/2 // ^ 1/3
x = (1/2)^(1/3)
x = (1/2)^(1/3)
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