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X^2+(4/5)*x = 1/5 // - 1/5
X^2+(4/5)*x-(1/5) = 0
X^2+(4/5)*x-1/5 = 0
X^2+4/5*x-1/5 = 0 // - X^2-1/5
4/5*x = -(X^2-1/5) // : 4/5
x = (-(X^2-1/5))/4/5
x = 5/4*(1/5-X^2)
x = 5/4*(1/5-X^2)
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