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X^2-(9*x) = 4/243 // - 4/243
X^2-(9*x)-(4/243) = 0
X^2-9*x-4/243 = 0
X^2-9*x-4/243 = 0 // - X^2-4/243
-9*x = -(X^2-4/243) // : -9
x = (-(X^2-4/243))/(-9)
x = (4/243-X^2)/(-9)
x = (4/243-X^2)/(-9)
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