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x in (-oo:+oo)
(14/7)*x^8-((35/7)*x^2) = 0
(14/7)*x^8-5*x^2 = 0
2*x^8-5*x^2 = 0
t_1 = x^2
2*t_1^4-5*t_1^1 = 0
2*t_1^4-5*t_1 = 0
t_1*(2*t_1^3-5) = 0
2*t_1^3 = 5 // : 2
t_1^3 = 5/2
t_1^3 = 5/2 // ^ 1/3
t_1 = (5/2)^(1/3)
t_1 = 0
t_1 = 0
t_1 = (5/2)^(1/3)
x^2-(5/2)^(1/3) = 0
1*x^2 = (5/2)^(1/3) // : 1
x^2 = (5/2)^(1/3)
x^2 = (5/2)^(1/3) // ^ 1/2
abs(x) = (5/2)^(1/6)
x = (5/2)^(1/6) or x = -(5/2)^(1/6)
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { (5/2)^(1/6), -(5/2)^(1/6), 0 }
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