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(w/2)*x^3 = 10 // - 10
(w/2)*x^3-10 = 0
1/2*w*x^3 = 10 // : 1/2*w
x^3 = 20*w^-1
x^3 = 20*w^-1 // ^ 1/3
x = 20^(1/3)*w^(-1/3)
x = 20^(1/3)*w^(-1/3)
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