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