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x in (-oo:+oo)
x^5 = 4/9 // - 4/9
x^5-(4/9) = 0
x^5-4/9 = 0
1*x^5 = 4/9 // : 1
x^5 = 4/9
x^5 = 4/9 // ^ 1/5
x = (4/9)^(1/5)
x = (4/9)^(1/5)
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