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x^3*((14*x^7-(4*x^3))/2) = 0
x^3*((14*x^7-4*x^3)/2) = 0
(x^3*(14*x^7-4*x^3))/2 = 0
14*x^7-4*x^3 = 0
2*x^3*(7*x^4-2) = 0
7*x^4 = 2 // : 7
x^4 = 2/7
x^4 = 2/7 // ^ 1/4
abs(x) = (2/7)^(1/4)
x = (2/7)^(1/4) or x = -(2/7)^(1/4)
2*x^3*(x-(2/7)^(1/4))*(x+(2/7)^(1/4)) = 0
(2*x^3*x^3*(x-(2/7)^(1/4))*(x+(2/7)^(1/4)))/2 = 0
( 2*x^3 )
2*x^3 = 0 // : 2
x^3 = 0
x = 0
( x+(2/7)^(1/4) )
x+(2/7)^(1/4) = 0 // - (2/7)^(1/4)
x = -(2/7)^(1/4)
( x-(2/7)^(1/4) )
x-(2/7)^(1/4) = 0 // + (2/7)^(1/4)
x = (2/7)^(1/4)
( x^3 )
1*x^3 = 0 // : 1
x^3 = 0
x = 0
x in { 0, -(2/7)^(1/4), (2/7)^(1/4), 0 }
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