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h in (-oo:+oo)
280 = 32*(1/2)*h // - 32*(1/2)*h
280-(32*(1/2)*h) = 0
280-16*h = 0
280-16*h = 0 // - 280
-16*h = -280 // : -16
h = -280/(-16)
h = 35/2
h = 35/2
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