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h in (-oo:+oo)
23-((1/2)*h) = 17.5 // - 17.5
23-((1/2)*h)-17.5 = 0
(-1/2)*h-17.5+23 = 0
5.5-1/2*h = 0 // - 5.5
-1/2*h = -5.5 // : -1/2
h = -5.5/(-1/2)
h = 11
h = 11
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