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h in (-oo:+oo)
9*(1/2)*h = 94.5 // - 94.5
9*(1/2)*h-94.5 = 0
9/2*h-94.5 = 0 // + 94.5
9/2*h = 94.5 // : 9/2
h = 94.5/9/2
h = 21
h = 21
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