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x^3*((4*x^7-(10*x^5))/2) = 0
x^3*((4*x^7-10*x^5)/2) = 0
(x^3*(4*x^7-10*x^5))/2 = 0
4*x^7-10*x^5 = 0
2*x^5*(2*x^2-5) = 0
2*x^2 = 5 // : 2
x^2 = 5/2
x^2 = 5/2 // ^ 1/2
abs(x) = (5/2)^(1/2)
x = (5/2)^(1/2) or x = -(5/2)^(1/2)
2*x^5*(x-(5/2)^(1/2))*(x+(5/2)^(1/2)) = 0
(2*x^3*x^5*(x-(5/2)^(1/2))*(x+(5/2)^(1/2)))/2 = 0
( 2*x^5 )
2*x^5 = 0 // : 2
x^5 = 0
x = 0
( x+(5/2)^(1/2) )
x+(5/2)^(1/2) = 0 // - (5/2)^(1/2)
x = -(5/2)^(1/2)
( x-(5/2)^(1/2) )
x-(5/2)^(1/2) = 0 // + (5/2)^(1/2)
x = (5/2)^(1/2)
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 0, -(5/2)^(1/2), (5/2)^(1/2), 0 }
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