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((2/5)*x^3)/5 = 11/5 // - 11/5
((2/5)*x^3)/5-(11/5) = 0
((2/5)*x^3)/5-11/5 = 0
2/25*x^3 = 11/5 // : 2/25
x^3 = 55/2
x^3 = 55/2 // ^ 1/3
x = (55/2)^(1/3)
x = (55/2)^(1/3)
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