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(x^3)/4 = 5.2 // - 5.2
(x^3)/4-5.2 = 0
1/4*x^3 = 5.2 // : 1/4
x^3 = 20.8
x^3 = 20.8 // ^ 1/3
x = 20.8^(1/3)
x = 20.8^(1/3)
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