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h in (-oo:+oo)
2*h^2 = 120/2 // - 120/2
2*h^2-(120/2) = 0
2*h^2-60 = 0
2*h^2 = 60 // : 2
h^2 = 30
h^2 = 30 // ^ 1/2
abs(h) = 30^(1/2)
h = 30^(1/2) or h = -30^(1/2)
h in { 30^(1/2), -30^(1/2) }
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