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(2/3)*x*(3.14*x)^2 = 150 // - 150
(2/3)*x*(3.14*x)^2-150 = 0
2/3*3.14^2*x^3 = 150 // : 2/3*3.14^2
x^3 = 225*3.14^-2
x^3 = 225*3.14^-2 // ^ 1/3
x = 225^(1/3)*3.14^(-2/3)
x = 225^(1/3)*3.14^(-2/3)
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