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3*x^(19/3)-15 = 0
3*x^(19/3) = 15 // : 3
x^(19/3) = 5
x^(19/3) = 5 // ^ 3
x^19 = 125 // ^ 1/19
x = 125^(1/19)
x = 125^(1/19)
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