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