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h in (-oo:+oo)
h/3.2-1.6 = 2.5 // - 2.5
h/3.2-2.5-1.6 = 0
0.3125*h-4.1 = 0 // + 4.1
0.3125*h = 4.1 // : 0.3125
h = 4.1/0.3125
h = 13.12
h = 13.12
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