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h in (-oo:+oo)
24 = 8*(1/2)*h // - 8*(1/2)*h
24-(8*(1/2)*h) = 0
24-4*h = 0
24-4*h = 0 // - 24
-4*h = -24 // : -4
h = -24/(-4)
h = 6
h = 6
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