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