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h in (-oo:+oo)
666.7 = 7*(1/3)*3.14^7*h // - 7*(1/3)*3.14^7*h
666.7-(7*(1/3)*3.14^7*h) = 0
(-7/3)*3.14^7*h+666.7 = 0
666.7-7/3*3.14^7*h = 0 // - 666.7
-7/3*3.14^7*h = -666.7 // : -7/3*3.14^7
h = -666.7/(-7/3*3.14^7)
h = 285.72857184*3.14^-7
h = 285.72857184*3.14^-7
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