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h in (-oo:+oo)
45 = 12*(1/2)*h // - 12*(1/2)*h
45-(12*(1/2)*h) = 0
45-6*h = 0
45-6*h = 0 // - 45
-6*h = -45 // : -6
h = -45/(-6)
h = 15/2
h = 15/2
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