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h in (-oo:+oo)
243 = 81*(1/3)*h // - 81*(1/3)*h
243-(81*(1/3)*h) = 0
243-27*h = 0
243-27*h = 0 // - 243
-27*h = -243 // : -27
h = -243/(-27)
h = 9
h = 9
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