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(X^2)/3-((3*x^1)/3)-4 = 0
(X^2)/3-x-4 = 0
1/3*X^2-x-4 = 0 // - 1/3*X^2-4
-x = -(1/3*X^2-4) // * -1
x = 1/3*X^2-4
x = 1/3*X^2-4
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