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3.14*27*x^8 = (3.14*h*r^2)/3 // - (3.14*h*r^2)/3
3.14*27*x^8-((3.14*h*r^2)/3) = 0
3.14*27*x^8-1.04666667*h*r^2 = 0
84.78*x^8 = -(-1.04666667*h*r^2) // : 84.78
x^8 = 0.01234568*h*r^2
x^8 = 0.01234568*h*r^2 // ^ 1/8
abs(x) = 0.01234568^(1/8)*h^(1/8)*r^(1/4)
x = 0.01234568^(1/8)*h^(1/8)*r^(1/4) or x = -(0.01234568^(1/8)*h^(1/8)*r^(1/4))
x in { 0.01234568^(1/8)*h^(1/8)*r^(1/4), -(0.01234568^(1/8)*h^(1/8)*r^(1/4)) }
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