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x*((8*x^2)/9)-(3/(-5)) = 0
x*((8*x^2)/9)+3/5 = 0
8/9*x^3 = -3/5 // : 8/9
x^3 = -27/40
x^3 = -27/40 // ^ 1/3
x = -(27/40)^(1/3)
x = -(27/40)^(1/3)
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