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(2*x^3)/4 = 16 // - 16
(2*x^3)/4-16 = 0
1/2*x^3 = 16 // : 1/2
x^3 = 32
x^3 = 32 // ^ 1/3
x = 2*4^(1/3)
x = 2*4^(1/3)
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