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4/9 = x^15 // - x^15
4/9-x^15 = 0
-1*x^15 = -4/9 // : -1
x^15 = 4/9
x^15 = 4/9 // ^ 1/15
x = (4/9)^(1/15)
x = (4/9)^(1/15)
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