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H in (-oo:+oo)
H/4 = 2.2 // - 2.2
H/4-2.2 = 0
1/4*H-2.2 = 0 // + 2.2
1/4*H = 2.2 // : 1/4
H = 2.2/1/4
H = 8.8
H = 8.8
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