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x in (-oo:+oo)
(2/5)*x^6 = 12 // - 12
(2/5)*x^6-12 = 0
2/5*x^6 = 12 // : 2/5
x^6 = 30
x^6 = 30 // ^ 1/6
abs(x) = 30^(1/6)
x = 30^(1/6) or x = -30^(1/6)
x in { 30^(1/6), -30^(1/6) }
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