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x in (-oo:+oo)
n = ((490/7)*x^6)/7 // - ((490/7)*x^6)/7
n-(((490/7)*x^6)/7) = 0
n-10*x^6 = 0
-10*x^6 = -n // : -10
x^6 = n/10
x^6 = n/10 // ^ 1/6
abs(x) = (n^(1/6))/(10^(1/6))
x = (n^(1/6))/(10^(1/6)) or x = -((n^(1/6))/(10^(1/6)))
x in { (n^(1/6))/(10^(1/6)), -((n^(1/6))/(10^(1/6))) }
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