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(6*x^6)/7-((7*x^2)/21) = 0
(6*x^6)/7+(-1/3)*x^2 = 0
6/7*x^6-1/3*x^2 = 0
t_1 = x^2
6/7*t_1^3-1/3*t_1^1 = 0
6/7*t_1^3-1/3*t_1 = 0
t_1*(6/7*t_1^2-1/3) = 0
6/7*t_1^2 = 1/3 // : 6/7
t_1^2 = 7/18
t_1^2 = 7/18 // ^ 1/2
abs(t_1) = (7/18)^(1/2)
t_1 = (7/18)^(1/2) or t_1 = -(7/18)^(1/2)
t_1 = 0
t_1 = 0
t_1 = (7/18)^(1/2)
x^2-(7/18)^(1/2) = 0
1*x^2 = (7/18)^(1/2) // : 1
x^2 = (7/18)^(1/2)
x^2 = (7/18)^(1/2) // ^ 1/2
abs(x) = (7/18)^(1/4)
x = (7/18)^(1/4) or x = -(7/18)^(1/4)
t_1 = -(7/18)^(1/2)
x^2+(7/18)^(1/2) = 0
1*x^2 = -(7/18)^(1/2) // : 1
x^2 = -(7/18)^(1/2)
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { (7/18)^(1/4), -(7/18)^(1/4), 0 }
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