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H in (-oo:+oo)
H/2+3.5 = 7.8 // - 7.8
H/2-7.8+3.5 = 0
1/2*H-4.3 = 0 // + 4.3
1/2*H = 4.3 // : 1/2
H = 4.3/1/2
H = 8.6
H = 8.6
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