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x in (-oo:+oo)
(5/7)*x-((1/4)*x)^10 = (-9/14)*x // - (-9/14)*x
(5/7)*x-((1/4)*x)^10-((-9/14)*x) = 0
(5/7)*x-((1/4)*x)^10+(9/14)*x = 0
19/14*x-x^10 = 0
x*(19/14-x^9) = 0
-1*x^9 = -19/14 // : -1
x^9 = 19/14
x^9 = 19/14 // ^ 1/9
x = (19/14)^(1/9)
x = 0
x = 0
x in { (19/14)^(1/9), 0 }
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