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x in (-oo:+oo)
120 = (12/2)*x^(2^3) // - (12/2)*x^(2^3)
120-((12/2)*x^(2^3)) = 0
120-6*x^(2^3) = 0
-6*x^8 = -120 // : -6
x^8 = 20
x^8 = 20 // ^ 1/8
abs(x) = 20^(1/8)
x = 20^(1/8) or x = -20^(1/8)
x in { 20^(1/8), -20^(1/8) }
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