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x in (-oo:+oo)
8*x-(((12/3)*x^6)/3)-(2*x) = 0
(-4/3)*x^6+8*x-2*x = 0
6*x-4/3*x^6 = 0
2*x*(3-2/3*x^5) = 0
-2/3*x^5 = -3 // : -2/3
x^5 = 9/2
x^5 = 9/2 // ^ 1/5
x = (9/2)^(1/5)
2*x = 0
2*x = 0 // : 2
x = 0
x in { (9/2)^(1/5), 0 }
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