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(2*x^3)/3 = 18-(2*f) // - 18-(2*f)
2*f+(2*x^3)/3-18 = 0
2/3*x^3 = -(2*f-18) // : 2/3
x^3 = 3/2*(18-(2*f))
x^3 = 3/2*(18-2*f) // ^ 1/3
x = (3/2)^(1/3)*(18-2*f)^(1/3)
x = (3/2)^(1/3)*(18-2*f)^(1/3)
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