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H in (-oo:+oo)
H/4 = 5/6 // - 5/6
H/4-(5/6) = 0
H/4-5/6 = 0
1/4*H-5/6 = 0 // + 5/6
1/4*H = 5/6 // : 1/4
H = 5/6/1/4
H = 10/3
H = 10/3
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