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h in (-oo:+oo)
240 = (8*12*h)/3 // - (8*12*h)/3
240-((8*12*h)/3) = 0
240-32*h = 0
240-32*h = 0 // - 240
-32*h = -240 // : -32
h = -240/(-32)
h = 15/2
h = 15/2
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