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(4*x^3)/2-5 = 103 // - 103
(4*x^3)/2-103-5 = 0
2*x^3 = 108 // : 2
x^3 = 54
x^3 = 54 // ^ 1/3
x = 3*2^(1/3)
x = 3*2^(1/3)
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