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x in (-oo:+oo)
x^2*((x^5-(6*x))/3) = 0
x^2*((x^5-6*x)/3) = 0
(x^2*(x^5-6*x))/3 = 0
x^5-6*x = 0
x*(x^4-6) = 0
1*x^4 = 6 // : 1
x^4 = 6
x^4 = 6 // ^ 1/4
abs(x) = 6^(1/4)
x = 6^(1/4) or x = -6^(1/4)
x*(x-6^(1/4))*(x+6^(1/4)) = 0
(x*x^2*(x-6^(1/4))*(x+6^(1/4)))/3 = 0
( x+6^(1/4) )
x+6^(1/4) = 0 // - 6^(1/4)
x = -6^(1/4)
( x-6^(1/4) )
x-6^(1/4) = 0 // + 6^(1/4)
x = 6^(1/4)
( x )
x = 0
( x^2 )
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { -6^(1/4), 6^(1/4), 0, 0 }
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