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x in (-oo:+oo)
8*x^8-(8*x^2)-(((28*x)/4)*x) = 0
8*x^8-8*x^2-7*x^2 = 0
8*x^8-15*x^2 = 0
t_1 = x^2
8*t_1^4-15*t_1^1 = 0
8*t_1^4-15*t_1 = 0
t_1*(8*t_1^3-15) = 0
8*t_1^3 = 15 // : 8
t_1^3 = 15/8
t_1^3 = 15/8 // ^ 1/3
t_1 = (15/8)^(1/3)
t_1 = 0
t_1 = 0
t_1 = (15/8)^(1/3)
x^2-(15/8)^(1/3) = 0
1*x^2 = (15/8)^(1/3) // : 1
x^2 = (15/8)^(1/3)
x^2 = (15/8)^(1/3) // ^ 1/2
abs(x) = (15/8)^(1/6)
x = (15/8)^(1/6) or x = -(15/8)^(1/6)
t_1 = 0
x^2+0 = 0
x^2 = 0
1*x^2 = 0 // : 1
x^2 = 0
x = 0
x in { (15/8)^(1/6), -(15/8)^(1/6), 0 }
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