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x in (-oo:+oo)
Y = x^2-(41/5) // - x^2-(41/5)
Y-x^2+41/5 = 0
-1*x^2 = -(Y+41/5) // : -1
x^2 = Y+41/5
x^2 = Y+41/5 // ^ 1/2
abs(x) = (Y+41/5)^(1/2)
x = (Y+41/5)^(1/2) or x = -(Y+41/5)^(1/2)
x in { (Y+41/5)^(1/2), -(Y+41/5)^(1/2) }
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