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x in (-oo:+oo)
X/4-(25*x^10) = 0
X/4-25*x^10 = 0
-25*x^10 = -(1/4*X) // : -25
x^10 = 1/100*X
x^10 = 1/100*X // ^ 1/10
abs(x) = (1/100)^(1/10)*X^(1/10)
x = (1/100)^(1/10)*X^(1/10) or x = -((1/100)^(1/10)*X^(1/10))
x in { (1/100)^(1/10)*X^(1/10), -((1/100)^(1/10)*X^(1/10)) }
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