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H in (-oo:+oo)
H/80 = 4/5 // - 4/5
H/80-(4/5) = 0
H/80-4/5 = 0
1/80*H-4/5 = 0 // + 4/5
1/80*H = 4/5 // : 1/80
H = 4/5/1/80
H = 64
H = 64
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