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