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x in (-oo:+oo)
x^6-(12/3)-1 = 0
x^6-4-1 = 0
1*x^6 = 5 // : 1
x^6 = 5
x^6 = 5 // ^ 1/6
abs(x) = 5^(1/6)
x = 5^(1/6) or x = -5^(1/6)
x in { 5^(1/6), -5^(1/6) }
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