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((n/9)*x^3)/4 = 8 // - 8
((n/9)*x^3)/4-8 = 0
1/36*n*x^3 = 8 // : 1/36*n
x^3 = 288*n^-1
x^3 = 288*n^-1 // ^ 1/3
x = 2*36^(1/3)*n^(-1/3)
x = 2*36^(1/3)*n^(-1/3)
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