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6-(3*(1/2)*x^6)+7 = 0
(-3/2)*x^6+6+7 = 0
-3/2*x^6 = -13 // : -3/2
x^6 = 26/3
x^6 = 26/3 // ^ 1/6
abs(x) = (26/3)^(1/6)
x = (26/3)^(1/6) or x = -(26/3)^(1/6)
x in { (26/3)^(1/6), -(26/3)^(1/6) }
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