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6*x^(7/3)-66 = 0
6*x^(7/3) = 66 // : 6
x^(7/3) = 11
x^(7/3) = 11 // ^ 3
x^7 = 1331 // ^ 1/7
x = 1331^(1/7)
x = 1331^(1/7)
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