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