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h in (-oo:+oo)
100 = (2*h*h)/2 // - (2*h*h)/2
100-((2*h*h)/2) = 0
100-h^2 = 0
-1*h^2 = -100 // : -1
h^2 = 100
h^2 = 100 // ^ 1/2
abs(h) = 10
h = 10 or h = -10
h in { 10, -10 }
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