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h in (-oo:+oo)
392.5 = 3.14*(1/3)*5^2*h // - 3.14*(1/3)*5^2*h
392.5-(3.14*(1/3)*5^2*h) = 0
392.5-1.04666667*5^2*h = 0
392.5-26.16666675*h = 0 // - 392.5
-26.16666675*h = -392.5 // : -26.16666675
h = -392.5/(-26.16666675)
h = 14.99999995
h = 14.99999995
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