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H in (-oo:+oo)
H/5 = 5.1 // - 5.1
H/5-5.1 = 0
1/5*H-5.1 = 0 // + 5.1
1/5*H = 5.1 // : 1/5
H = 5.1/1/5
H = 25.5
H = 25.5
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