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1/4-(((2/3)*x^3)/4) = 0
(-1/6)*x^3+1/4 = 0
-1/6*x^3 = -1/4 // : -1/6
x^3 = 3/2
x^3 = 3/2 // ^ 1/3
x = (3/2)^(1/3)
x = (3/2)^(1/3)
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