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(x^3)/4 = 729 // - 729
(x^3)/4-729 = 0
1/4*x^3 = 729 // : 1/4
x^3 = 2916
x^3 = 2916 // ^ 1/3
x = 9*4^(1/3)
x = 9*4^(1/3)
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