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h in (-oo:+oo)
270 = 81*(1/3)*h // - 81*(1/3)*h
270-(81*(1/3)*h) = 0
270-27*h = 0
270-27*h = 0 // - 270
-27*h = -270 // : -27
h = -270/(-27)
h = 10
h = 10
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