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h in (-oo:+oo)
66 = 3.14*9*(1/3)*h // - 3.14*9*(1/3)*h
66-(3.14*9*(1/3)*h) = 0
66-9.42*h = 0
66-9.42*h = 0 // - 66
-9.42*h = -66 // : -9.42
h = -66/(-9.42)
h = 7.00636943
h = 7.00636943
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