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x in (-oo:+oo)
(2/3)*x^12-6 = 0
2/3*x^12 = 6 // : 2/3
x^12 = 9
x^12 = 9 // ^ 1/12
abs(x) = 9^(1/12)
x = 9^(1/12) or x = -9^(1/12)
x in { 9^(1/12), -9^(1/12) }
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