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h in (-oo:+oo)
467.1 = 81*(1/3)*h // - 81*(1/3)*h
467.1-(81*(1/3)*h) = 0
467.1-27*h = 0
467.1-27*h = 0 // - 467.1
-27*h = -467.1 // : -27
h = -467.1/(-27)
h = 17.3
h = 17.3
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