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h in (-oo:+oo)
18069333.33333 = 440*440*(1/3)*h // - 440*440*(1/3)*h
18069333.33333-(440*440*(1/3)*h) = 0
(-193600/3)*h+18069333.33333 = 0
18069333.33333-193600/3*h = 0 // - 18069333.33333
-193600/3*h = -18069333.33333 // : -193600/3
h = -18069333.33333/(-193600/3)
h = 280
h = 280
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