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h in (-oo:+oo)
(1/25)*h^2 = 16 // - 16
(1/25)*h^2-16 = 0
1/25*h^2 = 16 // : 1/25
h^2 = 400
h^2 = 400 // ^ 1/2
abs(h) = 20
h = 20 or h = -20
h in { 20, -20 }
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