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