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h in (-oo:+oo)
640.6 = (1/3)*3.14^36*h // - (1/3)*3.14^36*h
640.6-((1/3)*3.14^36*h) = 0
(-1/3)*3.14^36*h+640.6 = 0
640.6-1/3*3.14^36*h = 0 // - 640.6
-1/3*3.14^36*h = -640.6 // : -1/3*3.14^36
h = -640.6/(-1/3*3.14^36)
h = 1921.80001922*3.14^-36
h = 1921.80001922*3.14^-36
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