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X^2+9*x-(2/3) = 0
X^2+9*x-2/3 = 0
X^2+9*x-2/3 = 0 // - X^2-2/3
9*x = -(X^2-2/3) // : 9
x = (-(X^2-2/3))/9
x = (2/3-X^2)/9
x = (2/3-X^2)/9
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