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5/12 = (x^3)/8 // - (x^3)/8
5/12-((x^3)/8) = 0
-1/8*x^3 = -5/12 // : -1/8
x^3 = 10/3
x^3 = 10/3 // ^ 1/3
x = (10/3)^(1/3)
x = (10/3)^(1/3)
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