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x in (-oo:+oo)
y = 5*X+(1/4)*x^2 // - 5*X+(1/4)*x^2
y-(5*X)-((1/4)*x^2) = 0
(-1/4)*x^2-5*X+y = 0
-1/4*x^2 = -(y-5*X) // : -1/4
x^2 = 4*(y-5*X)
x^2 = 4*(y-5*X) // ^ 1/2
abs(x) = 2*(y-5*X)^(1/2)
x = 2*(y-5*X)^(1/2) or x = -(2*(y-5*X)^(1/2))
x in { 2*(y-5*X)^(1/2), -(2*(y-5*X)^(1/2)) }
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