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