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