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X^2-((4/3)*x) = -(4/9) // + 4/9
X^2-((4/3)*x)+4/9 = 0
X^2+(-4/3)*x+4/9 = 0
X^2-4/3*x+4/9 = 0 // - X^2+4/9
-4/3*x = -(X^2+4/9) // : -4/3
x = (-(X^2+4/9))/(-4/3)
x = 3/4*(X^2+4/9)
x = 3/4*(X^2+4/9)
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