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X^2-((10/3)*x)-1 = 0
X^2+(-10/3)*x-1 = 0
X^2-10/3*x-1 = 0 // - X^2-1
-10/3*x = -(X^2-1) // : -10/3
x = (-(X^2-1))/(-10/3)
x = -3/10*(1-X^2)
x = -3/10*(1-X^2)
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