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z in (-oo:+oo)
(1/4)*z^2-((1/9)*z^2) = 1/24 // - 1/24
(1/4)*z^2-((1/9)*z^2)-(1/24) = 0
(1/4)*z^2+(-1/9)*z^2-1/24 = 0
5/36*z^2 = 1/24 // : 5/36
z^2 = 3/10
z^2 = 3/10 // ^ 1/2
abs(z) = (3/10)^(1/2)
z = (3/10)^(1/2) or z = -(3/10)^(1/2)
z in { (3/10)^(1/2), -(3/10)^(1/2) }
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