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x in (-oo:+oo)
45-((12/3)*x^8) = n // - n
45-n-((12/3)*x^8) = 0
45-n-4*x^8 = 0
-4*x^8 = -(45-n) // : -4
x^8 = (n-45)/(-4)
x^8 = (n-45)/(-4) // ^ 1/8
abs(x) = ((n-45)^(1/8))/((-4)^(1/8))
x = ((n-45)^(1/8))/((-4)^(1/8)) or x = -(((n-45)^(1/8))/((-4)^(1/8)))
x in { ((n-45)^(1/8))/((-4)^(1/8)), -(((n-45)^(1/8))/((-4)^(1/8))) }
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