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h in (-oo:+oo)
418.7 = (1/3)*3.14^2*h // - (1/3)*3.14^2*h
418.7-((1/3)*3.14^2*h) = 0
(-1/3)*3.14^2*h+418.7 = 0
418.7-1/3*3.14^2*h = 0 // - 418.7
-1/3*3.14^2*h = -418.7 // : -1/3*3.14^2
h = -418.7/(-1/3*3.14^2)
h = 1256.10001256*3.14^-2
h = 1256.10001256*3.14^-2
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