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x in (-oo:+oo)
9 = (13/20)*x^10 // - (13/20)*x^10
9-((13/20)*x^10) = 0
(-13/20)*x^10+9 = 0
-13/20*x^10 = -9 // : -13/20
x^10 = 180/13
x^10 = 180/13 // ^ 1/10
abs(x) = (180/13)^(1/10)
x = (180/13)^(1/10) or x = -(180/13)^(1/10)
x in { (180/13)^(1/10), -(180/13)^(1/10) }
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