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(1/2)*x^9 = 4 // - 4
(1/2)*x^9-4 = 0
1/2*x^9 = 4 // : 1/2
x^9 = 8
x^9 = 8 // ^ 1/9
x = 8^(1/9)
x = 8^(1/9)
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