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(x^3)/4 = 1/5 // - 1/5
(x^3)/4-(1/5) = 0
(x^3)/4-1/5 = 0
1/4*x^3 = 1/5 // : 1/4
x^3 = 4/5
x^3 = 4/5 // ^ 1/3
x = (4/5)^(1/3)
x = (4/5)^(1/3)
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