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x in (-oo:+oo)
(12/5)*x = (16/9)*x^10 // - (16/9)*x^10
(12/5)*x-((16/9)*x^10) = 0
(-16/9)*x^10+(12/5)*x = 0
12/5*x-16/9*x^10 = 0
4*x*(3/5-4/9*x^9) = 0
-4/9*x^9 = -3/5 // : -4/9
x^9 = 27/20
x^9 = 27/20 // ^ 1/9
x = (27/20)^(1/9)
4*x = 0
4*x = 0 // : 4
x = 0
x in { (27/20)^(1/9), 0 }
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