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x in (-oo:+oo)
v = (1/3)*h*x^2 // - (1/3)*h*x^2
v-((1/3)*h*x^2) = 0
(-1/3)*h*x^2+v = 0
-1/3*h*x^2 = -v // : -1/3*h
x^2 = 3*h^-1*v
x^2 = 3*h^-1*v // ^ 1/2
abs(x) = 3^(1/2)*h^(-1/2)*v^(1/2)
x = 3^(1/2)*h^(-1/2)*v^(1/2) or x = -(3^(1/2)*h^(-1/2)*v^(1/2))
x in { 3^(1/2)*h^(-1/2)*v^(1/2), -(3^(1/2)*h^(-1/2)*v^(1/2)) }
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