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((2*x)/3)*(x*((x^3)/6)-8) = 0
2/3*x*(1/6*x^4-8) = 0
( 1/6*x^4-8 )
1/6*x^4 = 8 // : 1/6
x^4 = 48
x^4 = 48 // ^ 1/4
abs(x) = 2*3^(1/4)
x = 2*3^(1/4) or x = -(2*3^(1/4))
( 2/3*x )
2/3*x = 0 // : 2/3
x = 0
x in { 2*3^(1/4), -(2*3^(1/4)), 0 }
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