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x in (-oo:+oo)
x*((x^2)/3) = 45 // - 45
x*((x^2)/3)-45 = 0
1/3*x^3 = 45 // : 1/3
x^3 = 135
x^3 = 135 // ^ 1/3
x = 3*5^(1/3)
x = 3*5^(1/3)
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