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H in (-oo:+oo)
H/4 = 3.1 // - 3.1
H/4-3.1 = 0
1/4*H-3.1 = 0 // + 3.1
1/4*H = 3.1 // : 1/4
H = 3.1/1/4
H = 12.4
H = 12.4
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