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x in (-oo:+oo)
h-((9*x^2)/h)+9*x^2 = 0
h-9*h^-1*x^2+9*x^2 = 0
t_1 = x^2
h-9*h^-1*t_1^1+9*t_1^1 = 0
h+9*t_1 = 0 // - h
9*t_1 = -h // : 9
t_1 = -h/9
t_1 = -h/9
x^2-(-h/9) = 0
(1/9)*h+x^2 = 0
1*x^2 = -(1/9*h) // : 1
x^2 = -1/9*h
x^2 = -1/9*h // ^ 1/2
abs(x) = (-1/9)^(1/2)*h^(1/2)
x = (-1/9)^(1/2)*h^(1/2) or x = -((-1/9)^(1/2)*h^(1/2))
x in { (-1/9)^(1/2)*h^(1/2), -((-1/9)^(1/2)*h^(1/2)) }
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