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h in (-oo:+oo)
(1/3)*h^2-12 = 0
1/3*h^2 = 12 // : 1/3
h^2 = 36
h^2 = 36 // ^ 1/2
abs(h) = 6
h = 6 or h = -6
h in { 6, -6 }
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