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