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9*x^(9/7)-18 = 0
9*x^(9/7) = 18 // : 9
x^(9/7) = 2
x^(9/7) = 2 // ^ 7
x^9 = 128 // ^ 1/9
x = 128^(1/9)
x = 128^(1/9)
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