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20/4-(2*x^6)+7 = 0
20/4-2*x^6+7 = 0
-2*x^6 = -12 // : -2
x^6 = 6
x^6 = 6 // ^ 1/6
abs(x) = 6^(1/6)
x = 6^(1/6) or x = -6^(1/6)
x in { 6^(1/6), -6^(1/6) }
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