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3*x^(7/3)-18 = 0
3*x^(7/3) = 18 // : 3
x^(7/3) = 6
x^(7/3) = 6 // ^ 3
x^7 = 216 // ^ 1/7
x = 216^(1/7)
x = 216^(1/7)
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