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x in (-oo:+oo)
(2/3)*x^18-12 = 0
2/3*x^18 = 12 // : 2/3
x^18 = 18
x^18 = 18 // ^ 1/18
abs(x) = 18^(1/18)
x = 18^(1/18) or x = -18^(1/18)
x in { 18^(1/18), -18^(1/18) }
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