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x*((15*x^7-(25*x^3))/5) = 0
x*((15*x^7-25*x^3)/5) = 0
(x*(15*x^7-25*x^3))/5 = 0
15*x^7-25*x^3 = 0
5*x^3*(3*x^4-5) = 0
3*x^4 = 5 // : 3
x^4 = 5/3
x^4 = 5/3 // ^ 1/4
abs(x) = (5/3)^(1/4)
x = (5/3)^(1/4) or x = -(5/3)^(1/4)
5*x^3*(x-(5/3)^(1/4))*(x+(5/3)^(1/4)) = 0
(5*x*x^3*(x-(5/3)^(1/4))*(x+(5/3)^(1/4)))/5 = 0
( 5*x^3 )
5*x^3 = 0 // : 5
x^3 = 0
x = 0
( x+(5/3)^(1/4) )
x+(5/3)^(1/4) = 0 // - (5/3)^(1/4)
x = -(5/3)^(1/4)
( x-(5/3)^(1/4) )
x-(5/3)^(1/4) = 0 // + (5/3)^(1/4)
x = (5/3)^(1/4)
( x )
x = 0
x in { 0, -(5/3)^(1/4), (5/3)^(1/4), 0 }
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