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h in (-oo:+oo)
1440 = (5*h)/2 // - (5*h)/2
1440-((5*h)/2) = 0
(-5/2)*h+1440 = 0
1440-5/2*h = 0 // - 1440
-5/2*h = -1440 // : -5/2
h = -1440/(-5/2)
h = 576
h = 576
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