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x*((18*x^2)/4) = 18 // - 18
x*((18*x^2)/4)-18 = 0
9/2*x^3 = 18 // : 9/2
x^3 = 4
x^3 = 4 // ^ 1/3
x = 4^(1/3)
x = 4^(1/3)
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