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x^3*((18*x^7-(10*x^3))/2) = 0
x^3*((18*x^7-10*x^3)/2) = 0
(x^3*(18*x^7-10*x^3))/2 = 0
18*x^7-10*x^3 = 0
2*x^3*(9*x^4-5) = 0
9*x^4 = 5 // : 9
x^4 = 5/9
x^4 = 5/9 // ^ 1/4
abs(x) = (5/9)^(1/4)
x = (5/9)^(1/4) or x = -(5/9)^(1/4)
2*x^3*(x-(5/9)^(1/4))*(x+(5/9)^(1/4)) = 0
(2*x^3*x^3*(x-(5/9)^(1/4))*(x+(5/9)^(1/4)))/2 = 0
( 2*x^3 )
2*x^3 = 0 // : 2
x^3 = 0
x = 0
( x+(5/9)^(1/4) )
x+(5/9)^(1/4) = 0 // - (5/9)^(1/4)
x = -(5/9)^(1/4)
( x-(5/9)^(1/4) )
x-(5/9)^(1/4) = 0 // + (5/9)^(1/4)
x = (5/9)^(1/4)
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 0, -(5/9)^(1/4), (5/9)^(1/4), 0 }
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