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h in (-oo:+oo)
284.7 = 3.14*16*(1/3)*h // - 3.14*16*(1/3)*h
284.7-(3.14*16*(1/3)*h) = 0
284.7-16.74666667*h = 0
284.7-16.74666667*h = 0 // - 284.7
-16.74666667*h = -284.7 // : -16.74666667
h = -284.7/(-16.74666667)
h = 17.00039809
h = 17.00039809
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