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13*x^3-(3*(4/3)) = 0
13*x^3-4 = 0
13*x^3 = 4 // : 13
x^3 = 4/13
x^3 = 4/13 // ^ 1/3
x = (4/13)^(1/3)
x = (4/13)^(1/3)
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