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H in (-oo:+oo)
H/8.1 = 4 // - 4
H/8.1-4 = 0
0.12345679*H-4 = 0 // + 4
0.12345679*H = 4 // : 0.12345679
H = 4/0.12345679
H = 32.40000003
H = 32.40000003
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