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