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H in (-oo:+oo)
(H/2)/1 = 3/11 // - 3/11
(H/2)/1-(3/11) = 0
H/2-3/11 = 0
1/2*H-3/11 = 0 // + 3/11
1/2*H = 3/11 // : 1/2
H = 3/11/1/2
H = 6/11
H = 6/11
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