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X^2-(8*x)+(16/9)*x-((36/3)*x)-(12/27) = 0
X^2-8*x+(16/9)*x-12*x-4/9 = 0
X^2-164/9*x-4/9 = 0 // - X^2-4/9
-164/9*x = -(X^2-4/9) // : -164/9
x = (-(X^2-4/9))/(-164/9)
x = -9/164*(4/9-X^2)
x = -9/164*(4/9-X^2)
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