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H in (-oo:+oo)
H/4 = 3/6 // - 3/6
H/4-(3/6) = 0
H/4-1/2 = 0
1/4*H-1/2 = 0 // + 1/2
1/4*H = 1/2 // : 1/4
H = 1/2/1/4
H = 2
H = 2
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