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x in (-oo:+oo)
9*x^5-((1/3)*x^9) = 0
(-1/3)*x^9+9*x^5 = 0
9*x^5-1/3*x^9 = 0
x^5*(9-1/3*x^4) = 0
-1/3*x^4 = -9 // : -1/3
x^4 = 27
x^4 = 27 // ^ 1/4
abs(x) = 27^(1/4)
x = 27^(1/4) or x = -27^(1/4)
x^5 = 0
1*x^5 = 0 // : 1
x^5 = 0
x = 0
x in { 27^(1/4), -27^(1/4), 0 }
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