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(1/2)*x^3 = 15 // - 15
(1/2)*x^3-15 = 0
1/2*x^3 = 15 // : 1/2
x^3 = 30
x^3 = 30 // ^ 1/3
x = 30^(1/3)
x = 30^(1/3)
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