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(x^3)/2 = 216 // - 216
(x^3)/2-216 = 0
1/2*x^3 = 216 // : 1/2
x^3 = 432
x^3 = 432 // ^ 1/3
x = 6*2^(1/3)
x = 6*2^(1/3)
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