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(x^3)/4 = 8 // - 8
(x^3)/4-8 = 0
1/4*x^3 = 8 // : 1/4
x^3 = 32
x^3 = 32 // ^ 1/3
x = 2*4^(1/3)
x = 2*4^(1/3)
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