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h in (-oo:+oo)
72 = 9*(1/2)*h // - 9*(1/2)*h
72-(9*(1/2)*h) = 0
(-9/2)*h+72 = 0
72-9/2*h = 0 // - 72
-9/2*h = -72 // : -9/2
h = -72/(-9/2)
h = 16
h = 16
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