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x in (-oo:+oo)
x*((3*x^2)/2) = 8/3 // - 8/3
x*((3*x^2)/2)-(8/3) = 0
x*((3*x^2)/2)-8/3 = 0
3/2*x^3 = 8/3 // : 3/2
x^3 = 16/9
x^3 = 16/9 // ^ 1/3
x = (16/9)^(1/3)
x = (16/9)^(1/3)
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