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x in (-oo:+oo)
x*((2*4*x^2)/2)+2 = 24.5 // - 24.5
x*((2*4*x^2)/2)-24.5+2 = 0
4*x^3 = 22.5 // : 4
x^3 = 5.625
x^3 = 5.625 // ^ 1/3
x = 5.625^(1/3)
x = 5.625^(1/3)
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