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(x^3)/4 = 78 // - 78
(x^3)/4-78 = 0
1/4*x^3 = 78 // : 1/4
x^3 = 312
x^3 = 312 // ^ 1/3
x = 2*39^(1/3)
x = 2*39^(1/3)
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