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X^2-((4*x)/3)-(14/9) = 0
X^2+(-4/3)*x-14/9 = 0
X^2-4/3*x-14/9 = 0 // - X^2-14/9
-4/3*x = -(X^2-14/9) // : -4/3
x = (-(X^2-14/9))/(-4/3)
x = -3/4*(14/9-X^2)
x = -3/4*(14/9-X^2)
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