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30*x^3-(((6*w)/6)*w) = 0
30*x^3-w^2 = 0
30*x^3 = w^2 // : 30
x^3 = (w^2)/30
x^3 = (w^2)/30 // ^ 1/3
x = (w^(2/3))/(30^(1/3))
x = (w^(2/3))/(30^(1/3))
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